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#1
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Way to slow down box fan?
Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor?
thx, H |
#2
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Way to slow down box fan?
On 7/29/2013 1:08 PM, heathcliff wrote:
Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? thx, H You could try a regular light dimmer. It's easy to build a unit for what you wish to do rather inexpensively. You can use 4" conduit box, one with the rounded corners, a dimmer, a duplex outlet and a combination 4" metal box cover with a position for a switch and the duplex outlet. You can get a cheep three wire extension cord and cur the outlet end off and use it to supply power to your dimmer. You'll need a cord grip to attach to the 4" box. Another route is to use a regular handy box with rounded corners, dimmer, metal switch cover, cheap extension cord, two cord grips and cut your dimmer into the middle of the extension cord. It's very easy to make. ^_^ TDD |
#3
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Way to slow down box fan?
On Mon, 29 Jul 2013 11:08:59 -0700 (PDT), heathcliff
wrote: Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? I know exactly what you mean about the noise. Almost any fan, when run slow enough, will be totally quiet. I don't know if a resistor would work, and rather than get into the possible problems, fire and everything, I'd recommend either a) getting a fan speed control and finding a box to mount it in, For the most part, the only fan speed controls I've ever found were the kind that fills the same size box that a wall switch or receptacle goes into. Pretty big. I did once come across, at an electronics flea market maybe, one about the size of a brownie, but I couldn't find a box the right size and ended up putting it one that was the right width and depth, but was 4 inches high. Hmmm, http://www.ebay.com/bhp/ac-motor-speed-contro The first one has a case and a cord l Not real attractive, but still. The second one I've never seen before. Only $6.50. I may switch to this if I ever need a sixth control. The two near the bottom are nice too http://www.ebay.com/itm/800W-AC-220V...-/321134354360 and http://www.ebay.com/itm/AC-220V-500W...-/141025594059 http://www.ebay.com/itm/2000W-25A-Vo...-/271236401606 http://www.ebay.com/itm/500W-AC-220V...-/321134354405 has its own plastic box http://www.ebay.com/itm/Solid-State-...-/141020556064 They didn't have any of this stuff 15 years ago, I think. Or b) getting a light dimmer, which usually comes already in a box and which also usually has a cord with a combination plug/receptacle, that you can plug the light [or fan] into and plug all of that into the wall. Whenever I recommend this, I'm certain to get criticism about how light dimmers won't work with motors, and they are correct that they are not designed for the purpose, and once in a while I find a dimmer that will not work with a fan (probably it's the fan that is different from other fans, and less likely that the dimmer won't work with any fan.) but I have 30 years experience here, with about 12 fans and 3 or 4 different kinds of dimmer, and I think only one fan, at most two, would not work with the light dimmer I tried it with. None have shown RF interference with the radio or tv. But you should never turn the speed down so low that the fan stops spinning. There were probably still be some current running through the fan motor, and if the energy in the current doesn't get turned into motion, it will be turned entirely into heat, with the possibility of a fire. (Although I seem to recall that I did test one combination, by turning the speed down just enough until it stopped, and letting it sit where it was always within my view for a 30 minutes and feeling the fan to see how hot it was. And it was only a trifle warm, so I probably decided it couldn't get too hot. But still there is no point to turning the speed down so it doesn't turn, when it's just as easy to turn the fan off. I only use the AC about 10 days a year, fewer now that it has broken, so I have a fan in almost every room, even in the basement (which never gets that hot but on humid days, the fan feels good), and when the house is warm, I use them every day. In the bedroom I had a small table fan, and sometimes it would get too cold at night, as it cooled off but the fan was still on. So I took a thermostat from a burned-out big box fan, mounted it in a big plastic cap from a large aerosol can, and wired that into fan wiring so the fan turns off completely if it gets colder than where I set it while I'm sleeping. The dimmer I use the most they sold for maybe 20 years or more, but they don't seem to sell it, at least not in the same case now. It is like this one http://www.amazon.com/Leviton-TBL03-...op+lamp+dimmer except the control box has square corners, is brown plastic, with a center plate that is brown metal, and a knob that slides up and down. (Perhaps a little better than a round knob when doing this in the dark) The only way to tell if newer dimmers work as well is to test one. This new one has the on/off switch built in, so that is very good, especially since it's not at the end of travel of a knob. You can turn off the fan without changing the speed, it seems clear. thx, H |
#4
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Way to slow down box fan?
On Mon, 29 Jul 2013 16:29:51 -0400, micky
wrote: and they are correct that they are not designed for the purpose, and once in a while I find a dimmer that will not work with a fan (probably it's the fan that is different from other fans, and less likely that the dimmer won't work with any fan.) When the dimmer didnn't work with the fan, I mean that the fan didn't spin at all no matter what setting the dimmer was on. But the dimmer did work with other fans. If the fan spun at all, everything else was fine, IME. |
#5
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Way to slow down box fan?
On Mon, 29 Jul 2013 16:29:51 -0400, micky
wrote: The dimmer I use the most they sold for maybe 20 years or more, but they don't seem to sell it, at least not in the same case now. It is like this one http://www.amazon.com/Leviton-TBL03-...op+lamp+dimmer except the control box has square corners, is brown plastic, with a center plate that is brown metal, and a knob that slides up and down. (Perhaps a little better than a round knob when doing this in the dark) The only way to tell if newer dimmers work as well is to test one. This new one has the on/off switch built in, so that is very You can see this if you rolll the cursor over the slider control and see the enlarged picture of the dimple at one end. good, especially since it's not at the end of travel of a knob. You can turn off the fan without changing the speed, it seems clear. More dimmers http://www.amazon.com/s/?ie=UTF8&key...l_937wg3ydmt_b http://www.lampsplus.com/products/di...le-top-dimmer/ http://www.homedepot.com/webapp/cata...gry=Search+All |
#6
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Way to slow down box fan?
replying to The Daring Dufas , passerby wrote:
the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. Since the actual complaint is noise, not RPMs per se, I would take the fan apart and try to balance the blades to deal with vibration. You know, disconnect the motor from power and spin the blades by hand. Mark which blade stops at the bottom, do it again. If the same blade stops at the bottom again, file some material off that blade, repeat until no single blade stops at the bottom repeatedly. Hard to say how effective it will be with lightweight plastic blades coupled to a badly constructed motor, but is worth a try. Not much else to do: if you have to look at the motor, you might as well just get yourself a new fan - motor is the bulk of the cost of it, anyway. -- posted from http://www.homeownershub.com/mainten...an-757381-.htm using HomeOwnersHub's Web, RSS and Social Media Interface to home and garden related groups |
#7
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Way to slow down box fan?
Ken,
Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. Forget the resistor. Dave M. |
#8
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Way to slow down box fan?
On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel"
wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) Forget the resistor. Dave M. |
#9
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Way to slow down box fan?
heathcliff wrote:
Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? Is it a lot quieter if tou hold it in the air so it doesn't touch anything else? If so, isolated it vibration wise, from the house structure with soft foam or something. Sometimes, most of the noise comes from the fan shaking the house or vibrating against it. |
#10
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Way to slow down box fan?
On 07/29/2013 02:08 PM, heathcliff wrote:
Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? thx, H The real solution would be to get a quieter fan, as a resistor in series with the low speed will draw just as much power as the low speed does now, and shed all its heat into the airflow going into your house. I know, that's not the DIY way, but it's the truth... If you really, really don't want to do that for whatever reason, I would remove the 3-speed switch, wire everything up so the fan runs on its FASTEST speed, and get a triac based motor speed control so your fan now has infinitely variable speed. nate -- replace "roosters" with "cox" to reply. http://members.cox.net/njnagel |
#11
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Way to slow down box fan?
Lamp dimmer control maybe?
.. Christopher A. Young Learn about Jesus www.lds.org .. On 7/29/2013 2:08 PM, heathcliff wrote: Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? thx, H |
#12
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Way to slow down box fan?
heathcliff wrote:
Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? thx, H Newer box fans are noisy. I have an older kmart box which is very quiet. Many upright fans are very quiet. NO resistor. Some motor speed controllers are only for brushed devices. A heavy duty dimmer will probably work, but may introduce buzzing. Greg |
#13
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Way to slow down box fan?
On Mon, 29 Jul 2013 18:59:49 -0400, Nate Nagel
wrote: On 07/29/2013 02:08 PM, heathcliff wrote: Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? thx, H The real solution would be to get a quieter fan, as a resistor in series with the low speed will draw just as much power as the low speed does now, and shed all its heat into the airflow going into your house. I know, that's not the DIY way, but it's the truth... If you really, really don't want to do that for whatever reason, I would remove the 3-speed switch, wire everything up so the fan runs on its FASTEST speed, Not a bad idea, except there's no need to remove the 3-speed switch. He can just set it to the highest speed. Then, if he or the next user ever stops using the speed control, he'll still have a 3-speed fan. However, my experience is that sometimes it's better to use the external speed control with the lowest speed. Frankly, I forget why, but it might have been this: Say the knob and the rheostat is such that one can set the control to any one of 200 physical positions. If the fan has natural speeds of 400, 800, and 1200, then at the low setting, one can control the speed in increments of 2, (2 x 200 = 400) but at the highest speed setting, he can only control the speed in increments of 6. If he's going to use a speed below 400 anyhow, he'll have more control over the speed when the fan is set at 400. (I'm not saying 400 or 1200 what, revolutions per something or other. I don't know what actual speeds these fans run at.) and get a triac based motor speed control so your fan now has infinitely variable speed. nate |
#14
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Way to slow down box fan?
On 7/29/2013 3:45 PM, passerby wrote:
replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. Since the actual complaint is noise, not RPMs per se, I would take the fan apart and try to balance the blades to deal with vibration. You know, disconnect the motor from power and spin the blades by hand. Mark which blade stops at the bottom, do it again. If the same blade stops at the bottom again, file some material off that blade, repeat until no single blade stops at the bottom repeatedly. Hard to say how effective it will be with lightweight plastic blades coupled to a badly constructed motor, but is worth a try. Not much else to do: if you have to look at the motor, you might as well just get yourself a new fan - motor is the bulk of the cost of it, anyway. My suggestion was about a low cost experiment. I built a variable voltage box using a triac, pot, trigger diode, capacitor, single 120 volt 15 amp outlet, cord, cord grip and sloped project box. I was able to use it for all sorts of things including shaded pole motors, light bulbs and universal AC/DC motors. If he uses a triac type dimmer, it should work. A dimmer using an SCR might not work very well. The link below is about LED dimming but shows the waveform output of a triac type dimmer. ^_^ http://www.digikey.com/us/en/techzon...C-Dimmers.html https://tinyurl.com/l655p55 TDD |
#15
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Way to slow down box fan?
On 7/29/2013 3:40 PM, micky wrote:
On Mon, 29 Jul 2013 16:29:51 -0400, micky wrote: The dimmer I use the most they sold for maybe 20 years or more, but they don't seem to sell it, at least not in the same case now. It is like this one http://www.amazon.com/Leviton-TBL03-...op+lamp+dimmer except the control box has square corners, is brown plastic, with a center plate that is brown metal, and a knob that slides up and down. (Perhaps a little better than a round knob when doing this in the dark) The only way to tell if newer dimmers work as well is to test one. This new one has the on/off switch built in, so that is very You can see this if you rolll the cursor over the slider control and see the enlarged picture of the dimple at one end. good, especially since it's not at the end of travel of a knob. You can turn off the fan without changing the speed, it seems clear. More dimmers http://www.amazon.com/s/?ie=UTF8&key...l_937wg3ydmt_b http://www.lampsplus.com/products/di...le-top-dimmer/ http://www.homedepot.com/webapp/cata...gry=Search+All Dang, I forgot all about the dimmer already built on to the cord. The only thing I don't know about them is whether or not they use a triac. Perhaps one made to dim LED lamps would work better but those may use SCR's instead of triacs. I'm so use to building things I forgot about the ready made dimmers on a cord. O_o TDD |
#16
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Way to slow down box fan?
On 7/29/2013 4:20 PM, micky wrote:
On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD |
#17
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Way to slow down box fan?
On Mon, 29 Jul 2013 22:26:19 -0500, The Daring Dufas
wrote: Dang, I forgot all about the dimmer already built on to the cord. The only thing I don't know about them is whether or not they use a triac. Perhaps one made to dim LED lamps would work better but those may use SCR's instead of triacs. I'm so use to building things I forgot about the ready made dimmers on a cord. O_o LOL. This reminds me of when I wanted to build a lid for lidless frypan, but you all convinced me to buy one meant for another pan or pot. (I had to go to 8 thrift shops, but it took only about 5 minutes each and was a lotl easier than making one.) TDD |
#18
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Way to slow down box fan?
On Mon, 29 Jul 2013 22:30:41 -0500, The Daring Dufas
wrote: On 7/29/2013 4:20 PM, micky wrote: On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD Good plan. When I was in college my 80-year old cousin gave me his '50 Olds, in 1968, I noticed a similar car and left a note trying to buy his back-up lights. He wouldn't sell but we became friends. He was 30 or 35 and would drive his '50 olds around campus, saying he thought the college girls might find the car interesting. I'm sure none did, but I didnt' tell the guy since it seemed to be his whole social life. He had two models of the 50 Olds, or a 50 and 51, and he had a whole townhouse stuffed full of electronic parts, etc. on the first floor at least, that he bought in bulk at auctions. He lived somewhere else. Later, when my brother went to Viet Nam, he gave me his '65 Pontiac Catalina convertible, and when I left town 18 months after that, I couldn't take both. I didn't want to but I gave my Olds to my friend, so he had three! |
#19
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Way to slow down box fan?
On 7/29/2013 11:22 PM, micky wrote:
On Mon, 29 Jul 2013 22:30:41 -0500, The Daring Dufas wrote: On 7/29/2013 4:20 PM, micky wrote: On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD Good plan. When I was in college my 80-year old cousin gave me his '50 Olds, in 1968, I noticed a similar car and left a note trying to buy his back-up lights. He wouldn't sell but we became friends. He was 30 or 35 and would drive his '50 olds around campus, saying he thought the college girls might find the car interesting. I'm sure none did, but I didnt' tell the guy since it seemed to be his whole social life. He had two models of the 50 Olds, or a 50 and 51, and he had a whole townhouse stuffed full of electronic parts, etc. on the first floor at least, that he bought in bulk at auctions. He lived somewhere else. Later, when my brother went to Viet Nam, he gave me his '65 Pontiac Catalina convertible, and when I left town 18 months after that, I couldn't take both. I didn't want to but I gave my Olds to my friend, so he had three! Man I wish I still had my 1981 Dodge Aries station wagon. It was a neat little car with bucket seats and four on the floor which was unusual for those funky little cars especially in a wagon. I got the roller cam from a later model 2.2L engine and it bolted right in and improved performance but the other thing that really helped was getting the clutch and flywheel off a turbo version of the 2.2L engine and it was a direct bolt in too. The friction surface and disk took up the whole flywheel which gave me the ability to lite up the front tires without any clutch slippage. Darn, I wish I still had the little critter. ^_^ TDD |
#20
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Way to slow down box fan?
On 07/29/2013 11:30 PM, The Daring Dufas wrote:
On 7/29/2013 4:20 PM, micky wrote: On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD For "Small SUV" I don't think anyone will ever top the Jeep Cherokee or early Grand Cherokee... everything since has either been too big or not capable enough. It'll be a sad day when mine dies but I'm hoping to postpone that day as long as possible. nate -- replace "roosters" with "cox" to reply. http://members.cox.net/njnagel |
#21
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Way to slow down box fan?
On 7/30/2013 6:54 AM, Nate Nagel wrote:
On 07/29/2013 11:30 PM, The Daring Dufas wrote: On 7/29/2013 4:20 PM, micky wrote: On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD For "Small SUV" I don't think anyone will ever top the Jeep Cherokee or early Grand Cherokee... everything since has either been too big or not capable enough. It'll be a sad day when mine dies but I'm hoping to postpone that day as long as possible. nate Yea, I was thinking about an older Jeep Cherokee with the straight 6 in it because I loved my Slant Sixes in my Mopars. I even built a 170cid Slant Six with a 3/4 race cam. It was a real hoot to wind that little sucker up but I kept blowing the stock muffler off of it at high rpm. ^_^ TDD |
#22
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Way to slow down box fan?
On Tuesday, July 30, 2013 7:14:55 AM UTC-5, The Daring Dufas wrote:
Yea, I was thinking about an older Jeep Cherokee with the straight 6 in it because I loved my Slant Sixes in my Mopars. I even built a 170cid Slant Six with a 3/4 race cam. It was a real hoot to wind that little sucker up but I kept blowing the stock muffler off of it at high rpm. ^_^ TDD It's funny that cars occupy a place in our hearts...I'm sure it's the memories that went with them and not the cars themselves... |
#23
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Way to slow down box fan?
On 07/30/2013 08:14 AM, The Daring Dufas wrote:
On 7/30/2013 6:54 AM, Nate Nagel wrote: On 07/29/2013 11:30 PM, The Daring Dufas wrote: On 7/29/2013 4:20 PM, micky wrote: On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD For "Small SUV" I don't think anyone will ever top the Jeep Cherokee or early Grand Cherokee... everything since has either been too big or not capable enough. It'll be a sad day when mine dies but I'm hoping to postpone that day as long as possible. nate Yea, I was thinking about an older Jeep Cherokee with the straight 6 in it because I loved my Slant Sixes in my Mopars. I even built a 170cid Slant Six with a 3/4 race cam. It was a real hoot to wind that little sucker up but I kept blowing the stock muffler off of it at high rpm. ^_^ TDD Not the same thing... the old slant six was a MoPar design, the Jeep six was based on a similarly ancient and dead nuts reliable AMC design. I have owned both and like both but the later "high output" 4.0 Jeep engine is way stronger than a 225 slant six. Actually have to watch your right foot when it's damp out and you're in 2WD nate -- replace "roosters" with "cox" to reply. http://members.cox.net/njnagel |
#24
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Way to slow down box fan?
On 7/29/2013 9:18 PM, The Daring Dufas wrote:
On 7/29/2013 3:45 PM, passerby wrote: replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. Since the actual complaint is noise, not RPMs per se, I would take the fan apart and try to balance the blades to deal with vibration. You know, disconnect the motor from power and spin the blades by hand. Mark which blade stops at the bottom, do it again. If the same blade stops at the bottom again, file some material off that blade, repeat until no single blade stops at the bottom repeatedly. Hard to say how effective it will be with lightweight plastic blades coupled to a badly constructed motor, but is worth a try. Not much else to do: if you have to look at the motor, you might as well just get yourself a new fan - motor is the bulk of the cost of it, anyway. My suggestion was about a low cost experiment. I built a variable voltage box using a triac, pot, trigger diode, capacitor, single 120 volt 15 amp outlet, cord, cord grip and sloped project box. I was able to use it for all sorts of things including shaded pole motors, light bulbs and universal AC/DC motors. If he uses a triac type dimmer, it should work. A dimmer using an SCR might not work very well. The link below is about LED dimming but shows the waveform output of a triac type dimmer. ^_^ http://www.digikey.com/us/en/techzon...C-Dimmers.html https://tinyurl.com/l655p55 TDD If you use a triac dimmer control the motor torque falls off pretty rapidly. But as you reduce the fan speed the torque required falls off rapidly also, something like the 3rd power of the RPM. I never used a dimmer to control a fan, but it might work. From mickey, it often does work. I believe a triac dimmer will maintain torque better than a resistor. The box fans I have make noise because of the air being moved, not because of balance problems. |
#25
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Way to slow down box fan?
On 7/29/2013 1:08 PM, heathcliff wrote:
Just bought a cheapo box fan, which we use in a window at night to draw in cooler outside air. However, even at the slowest of its 3 speeds, the fan is too noisy. I'd like to make it less noisy, which I think the best way would be to make it turn slower. I'm wondering if it would be possible to wire in a resistor in series with the motor to accomplish that. If so, what would be the correct specs on the resistor? thx, H use a dimmer. -- Steve Barker remove the "not" from my address to email |
#26
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Way to slow down box fan?
On 7/30/2013 10:03 AM, bud-- wrote:
On 7/29/2013 9:18 PM, The Daring Dufas wrote: On 7/29/2013 3:45 PM, passerby wrote: replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. Since the actual complaint is noise, not RPMs per se, I would take the fan apart and try to balance the blades to deal with vibration. You know, disconnect the motor from power and spin the blades by hand. Mark which blade stops at the bottom, do it again. If the same blade stops at the bottom again, file some material off that blade, repeat until no single blade stops at the bottom repeatedly. Hard to say how effective it will be with lightweight plastic blades coupled to a badly constructed motor, but is worth a try. Not much else to do: if you have to look at the motor, you might as well just get yourself a new fan - motor is the bulk of the cost of it, anyway. My suggestion was about a low cost experiment. I built a variable voltage box using a triac, pot, trigger diode, capacitor, single 120 volt 15 amp outlet, cord, cord grip and sloped project box. I was able to use it for all sorts of things including shaded pole motors, light bulbs and universal AC/DC motors. If he uses a triac type dimmer, it should work. A dimmer using an SCR might not work very well. The link below is about LED dimming but shows the waveform output of a triac type dimmer. ^_^ http://www.digikey.com/us/en/techzon...C-Dimmers.html https://tinyurl.com/l655p55 TDD If you use a triac dimmer control the motor torque falls off pretty rapidly. But as you reduce the fan speed the torque required falls off rapidly also, something like the 3rd power of the RPM. I never used a dimmer to control a fan, but it might work. From mickey, it often does work. I believe a triac dimmer will maintain torque better than a resistor. The box fans I have make noise because of the air being moved, not because of balance problems. You don't really have to be concerned about starting torque with a fan but if it's a problem, crank the dimmer wide open to start then back off. ^_^ TDD |
#27
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Way to slow down box fan?
On 7/30/2013 7:33 AM, Nate Nagel wrote:
On 07/30/2013 08:14 AM, The Daring Dufas wrote: On 7/30/2013 6:54 AM, Nate Nagel wrote: On 07/29/2013 11:30 PM, The Daring Dufas wrote: On 7/29/2013 4:20 PM, micky wrote: On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) I have an 89 full sized Dodge van that's older than the girls I chase. The poor old guy makes all kinds of noise. I'm looking for a vehicle manufactured in this century like a small SUV and I'll keep the old van since it carries a lot of stuff and has a ladder rack. ^_^ TDD For "Small SUV" I don't think anyone will ever top the Jeep Cherokee or early Grand Cherokee... everything since has either been too big or not capable enough. It'll be a sad day when mine dies but I'm hoping to postpone that day as long as possible. nate Yea, I was thinking about an older Jeep Cherokee with the straight 6 in it because I loved my Slant Sixes in my Mopars. I even built a 170cid Slant Six with a 3/4 race cam. It was a real hoot to wind that little sucker up but I kept blowing the stock muffler off of it at high rpm. ^_^ TDD Not the same thing... the old slant six was a MoPar design, the Jeep six was based on a similarly ancient and dead nuts reliable AMC design. I have owned both and like both but the later "high output" 4.0 Jeep engine is way stronger than a 225 slant six. Actually have to watch your right foot when it's damp out and you're in 2WD nate Heck, I'm very aware of the differences, I wrote straight 6 in the Jeep, not Slant Six. My dad owned a 51 Dodge sedan that had the old L-head six which Chrysler continued to manufacture as an industrial engine long after they stopped using it in cars and trucks. I know a tiny little bit about engines, I've rebuilt a variety of them and my favorite Ford engine is the 300cid straight six. I think it was used in a lot of UPS trucks at one time or so I heard. I'm really looking for a "small" SUV with a four banger but I tried to get into a Honda and as usual, I cracked my fracking head open on the door frame. ^_^ TDD |
#28
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Way to slow down box fan?
On Tue, 30 Jul 2013 09:03:48 -0600, bud--
wrote: On 7/29/2013 9:18 PM, The Daring Dufas wrote: On 7/29/2013 3:45 PM, passerby wrote: replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. Since the actual complaint is noise, not RPMs per se, I would take the fan apart and try to balance the blades to deal with vibration. You know, disconnect the motor from power and spin the blades by hand. Mark which blade stops at the bottom, do it again. If the same blade stops at the bottom again, file some material off that blade, repeat until no single blade stops at the bottom repeatedly. Hard to say how effective it will be with lightweight plastic blades coupled to a badly constructed motor, but is worth a try. Not much else to do: if you have to look at the motor, you might as well just get yourself a new fan - motor is the bulk of the cost of it, anyway. My suggestion was about a low cost experiment. I built a variable voltage box using a triac, pot, trigger diode, capacitor, single 120 volt 15 amp outlet, cord, cord grip and sloped project box. I was able to use it for all sorts of things including shaded pole motors, light bulbs and universal AC/DC motors. If he uses a triac type dimmer, it should work. A dimmer using an SCR might not work very well. The link below is about LED dimming but shows the waveform output of a triac type dimmer. ^_^ http://www.digikey.com/us/en/techzon...C-Dimmers.html https://tinyurl.com/l655p55 TDD If you use a triac dimmer control the motor torque falls off pretty rapidly. But as you reduce the fan speed the torque required falls off rapidly also, something like the 3rd power of the RPM. I never used a dimmer to control a fan, but it might work. From mickey, it often does work. I should say that every fan I have except the 4" fan (which is a year old) is over 25 years old. I have a Tintang** (or something like that, 2-speed fan) that is about 25 years old, but I've never used a speed control with it, or with the 4" fan. **Co-workers gave me this when they felt sorry for me when I was using a fan from the '30's. But I liked the older fan more, until it caught fire last summer (fan stopped, overheated, and set fire to too much light oil). The rest are 30 to 80 years old. I don't think newer fans from the last 10 years are made differently from my older ones, which are all (except maybe one) brushless, induction motors. I guess I could try dimmers on those two newer fans if anyone was curious. I got the old fans, with iron or heavy steel bases, from my father when he died in 1955 at age 62. They were in his office or our home. I believe a triac dimmer will maintain torque better than a resistor. The box fans I have make noise because of the air being moved, not because of balance problems. Yeah. |
#29
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Way to slow down box fan?
On Monday, July 29, 2013 5:20:31 PM UTC-4, micky wrote:
On Mon, 29 Jul 2013 16:56:10 -0400, "David L. Martel" wrote: Ken, Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) Forget the resistor. Dave M. If the noise is causes by too much air being moved, maybe blocking part of the fan by inserting a piece of cardboard in the grill-work would help. |
#30
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Way to slow down box fan?
On 07/31/13 07:58 am, Pavel314 wrote:
Return the fan and try another brand. If you can't find one that's quiet enough look into balancing the blades. That's where the noise is coming from, most likely. A lof of fan noise is not caused by out-of-balance fans but by the air which is moving because of the fan. No matter how good the bearings or how well balanced the blades, if there is too much air moving, one can hear that. Many people may not mind or even notice, since it's the essense of a fan to move air, but I sure mind. Maybe that's what is bothering Heathcliff too. (My last 3 Chrysler LeBarons had 4 speed fans, and I almost always kept the speed on 2, almost the slowest, because that was the fastest speed I could not hear. After 23 years with LeBarons, I bought a Toyota Solara, which has 5 fan speeds. Sounds better, but only the lowest speed is silent. But the lowest speed moves less air than speed 2 (and maybe even speed 1) of the LeBaron. So I'm forced to use speed 2 and put up with the noise. (One of twenty reasons so far that the Chryslers (and the GM cars) were better than the Toyota.) Forget the resistor. If the noise is causes by too much air being moved, maybe blocking part of the fan by inserting a piece of cardboard in the grill-work would help. Keep in mind that the airflow has to keep the fan motor cool enough as well; restricting the airflow may allow the motor to overheat. AND some kinds of electric motor (I don't recall which) overheat when run on a reduced voltage, so the resistor or dimmer suggestions made earlier may not be a good idea either. Perce |
#31
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Way to slow down box fan?
On Mon, 29 Jul 2013 20:45:02 +0000, passerby
wrote: replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. I've put dimmers on fans and all you do it trade off some fan blade noise for increased motor noise because the solid state dimmers just chop the current up and make the motor "buzz". The only way to do it without the buzz is with an old fashioned transformer based dimmer/motor controller. |
#32
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Way to slow down box fan?
On 8/3/2013 3:43 AM, Ashton Crusher wrote:
On Mon, 29 Jul 2013 20:45:02 +0000, passerby wrote: replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. I've put dimmers on fans and all you do it trade off some fan blade noise for increased motor noise because the solid state dimmers just chop the current up and make the motor "buzz". The only way to do it without the buzz is with an old fashioned transformer based dimmer/motor controller. Otherwise know as a variable autotransformer or Variac. The dimmers using a triac instead of an SCR may be less likely to make the fan motor buzz. I've seen Variac light dimmers used in recording studios because they don't make the lights buss or add noise to the electrical power for the studio. ^_^ https://en.wikipedia.org/wiki/Autotransformer http://www.variac.com/ TDD |
#33
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Way to slow down box fan?
On Sat, 03 Aug 2013 01:43:16 -0700, Ashton Crusher
wrote: On Mon, 29 Jul 2013 20:45:02 +0000, passerby m wrote: replying to The Daring Dufas , passerby wrote: the-daring-dufas wrote: You could try a regular light dimmer. Small AC fans usually have shaded pole motors, RPM of which is frequency dependent. By cutting off part of the phase with a light dimmer you will just make it start even harder than it already is for this type of a motor. There may be *some* RPM control due to torque losses when dimmer is dialed down, but it's only a small percentage point around the designed RPM, not from 0 to the max. I've put dimmers on fans and all you do it trade off some fan blade noise for increased motor noise because the solid state dimmers just chop the current up and make the motor "buzz". Not in my experience. In one case the dimmer was a foot from my ear when I lie down and the fan was 18 inches. Still heard no humming or buzzing. And since the reason I use the dimmer is mostly to get rid of noise, I would notice. There is probably a lot of variety in motors and fans, and even maybe dimmers. The only way to do it without the buzz is with an old fashioned transformer based dimmer/motor controller. |
#34
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Way to slow down box fan?
replying to pilgrim, JP Huie wrote:
Just want to add that a larger fan (blade diameter) will produce less noise for the amount of air moved. So a larger fan (I'd shoot for 20" at least) on a slowish speed might move enough air AND be quieter. Problem may be finding one... I bought earlier model of this from Amazon, but reviews on current model arent' to good. You can check Grainger but they don't seem to give the diameters, so maybe go to mfg's website for that... https://www.amazon.com/AirKing-9166-...657395&sr=1-10 -- posted from http://www.homeownershub.com/mainten...an-757381-.htm |
#35
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Way to slow down box fan?
On Mon, 04 Jul 2016 19:44:02 +0000, JP Huie
wrote: replying to pilgrim, JP Huie wrote: I've been reading this group for maybe 20 years and I don't remember any pilgrim. But I might have missed say, one lone post. If he's still reading I have some info, but I'm not going to the trouble of writing it unless someone who is reading wants to know how to slow a fan. Just want to add that a larger fan (blade diameter) will produce less noise for the amount of air moved. So a larger fan (I'd shoot for 20" at least) on a slowish speed might move enough air AND be quieter. Problem may be finding one... I bought earlier model of this from Amazon, but reviews on current model arent' to good. You can check Grainger but they don't seem to give the diameters, so maybe go to mfg's website for that... https://www.amazon.com/AirKing-9166-...657395&sr=1-10 |
#36
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Way to slow down box fan?
On Monday, July 4, 2016 at 4:02:57 PM UTC-5, Micky wrote:
On Mon, 04 Jul 2016 19:44:02 +0000, JP Huie wrote: replying to pilgrim, JP Huie wrote: I've been reading this group for maybe 20 years and I don't remember any pilgrim. But I might have missed say, one lone post. If he's still reading I have some info, but I'm not going to the trouble of writing it unless someone who is reading wants to know how to slow a fan. Just want to add that a larger fan (blade diameter) will produce less noise for the amount of air moved. So a larger fan (I'd shoot for 20" at least) on a slowish speed might move enough air AND be quieter. Problem may be finding one... I bought earlier model of this from Amazon, but reviews on current model arent' to good. You can check Grainger but they don't seem to give the diameters, so maybe go to mfg's website for that... https://www.amazon.com/AirKing-9166-...657395&sr=1-10 If you bothered to go to the link you would see...even TDD is there, from 2 yrs ago! :^( |
#37
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Way to slow down box fan?
replying to The Daring Dufas, Shawn hill wrote:
best thing to do is buy something that will reduce the amps not the volts because the speed is changed by a tapped winding in the motor which reduces the amperage -- for full context, visit http://www.homeownershub.com/mainten...an-757381-.htm |
#38
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Way to slow down box fan?
On Saturday, September 17, 2016 at 5:44:04 PM UTC-5, Shawn hill wrote:
replying to The Daring Dufas, Shawn hill wrote: best thing to do is buy something that will reduce the amps not the volts because the speed is changed by a tapped winding in the motor which reduces the amperage -- for full context, visit http://www.homeownershub.com/mainten...an-757381-.htm TDD has gone the way of the Mormon...and is no longer with us. Alas! |
#39
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Way to slow down box fan?
On 2016-09-17 6:52 PM, bob_villa wrote:
On Saturday, September 17, 2016 at 5:44:04 PM UTC-5, Shawn hill wrote: replying to The Daring Dufas, Shawn hill wrote: best thing to do is buy something that will reduce the amps not the volts because the speed is changed by a tapped winding in the motor which reduces the amperage -- for full context, visit http://www.homeownershub.com/mainten...an-757381-.htm TDD has gone the way of the Mormon...and is no longer with us. Alas! BS, he is too busy, but still alive. -- Froz.... |
#40
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Way to slow down box fan?
On Saturday, September 17, 2016 at 8:18:53 PM UTC-5, FrozenNorth wrote:
On 2016-09-17 6:52 PM, bob_villa wrote: On Saturday, September 17, 2016 at 5:44:04 PM UTC-5, Shawn hill wrote: replying to The Daring Dufas, Shawn hill wrote: best thing to do is buy something that will reduce the amps not the volts because the speed is changed by a tapped winding in the motor which reduces the amperage -- for full context, visit http://www.homeownershub.com/mainten...an-757381-.htm TDD has gone the way of the Mormon...and is no longer with us. Alas! BS, he is too busy, but still alive. -- Froz.... He laughed when I told him he was dead because he hasn't posted to Usenet but unfortunately the IRS doesn't use that as proof. Usenet is too addictive and takes up a lot of time which is why my brother is staying away right now that he's taking up my slack on the business end. He was sad to hear and even a bit angry that Stormin Mormon had died alone on a roof. Paramedics saved both of us when had heart attacks. The difference is that each of us was around people and close to paramedics when it happened. I wish Stormy had been able to call for help, firemen would have gotten him off that roof quickly and saved his life. (Σ_Σ) [8~{} Uncle Sad Monster |
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