I'm planning to use an inline fan for a range hood - I'm going to have the
canopy made by a metal fabricator. I'm putting the fan in the attic.
I'm looking for something

- about 300 CFM max
- can be speed controlled about all the way to 0.
- doesn't make a hum or whatever when speed controlled.
- Absolutely as quiet as possible.

I've heard that if you compare a small fan with a large fan that's turned
down with a speed control to move the same CFM as the small fan, the large
fan will be quieter.

Somebody at Fantech told me this wasn't true, that the noise just depends
on the CFM the fan is moving. I don't believe this (she said other very
dubious things), because I've heard elsewhere that a larger fan will be moving
with a lower RPM when it's moving the same amount of air, so it would be
quieter.

So, I figure I'd get about a 300 CFM fan and turn it down with a speed
control. My range is very small and it doesn't need a big fan.

Some fans make a low-voltage hum when you use a speed control on them.
Fantech said their fans do. Someone at Broan told me their inline duct
fan doesn't have a low-voltage hum when speed controlled. I don't know how big
of a deal the low-voltage hum is, compared to the noise from the fan
motor.

What inline fans are quietest? They don't have a standard way of testing
the noise from them, unfortunately.

I know stuff about reducing the noise that's moving through the duct -
duct silencer, liquid soundproofing you can spray inside the duct. Etc.
etc. My question though is about the quietest *fan*.

Laura

(Lacustral) wrote:

I'm planning to use an inline fan for a range hood - I'm going to have the
canopy made by a metal fabricator.

You might want to check what code is before you invest a lot in this setup.
Seems to me there's issues with potential grease buildup on a remote fan for a
range vent that causes this to not be allowed.

--
"Tell me what I should do, Annie."
"Stay. Here. Forever." - Life On Mars

Lacustral wrote:
I'm planning to use an inline fan for a range hood - I'm going to
have the canopy made by a metal fabricator. I'm putting the fan in
the attic.
I'm looking for something

- about 300 CFM max
- can be speed controlled about all the way to 0.
- doesn't make a hum or whatever when speed controlled.
- Absolutely as quiet as possible.

I've heard that if you compare a small fan with a large fan that's
turned
down with a speed control to move the same CFM as the small fan,
the large
fan will be quieter.

Somebody at Fantech told me this wasn't true, that the noise just
depends
on the CFM the fan is moving. I don't believe this (she said other
very dubious things), because I've heard elsewhere that a larger
fan will be moving with a lower RPM when it's moving the same
amount of air, so it would be quieter.

So, I figure I'd get about a 300 CFM fan and turn it down with a
speed control. My range is very small and it doesn't need a big
fan.

Some fans make a low-voltage hum when you use a speed control on
them.
Fantech said their fans do. Someone at Broan told me their inline
duct
fan doesn't have a low-voltage hum when speed controlled. I don't
know how big of a deal the low-voltage hum is, compared to the
noise from the fan
motor.

What inline fans are quietest? They don't have a standard way of
testing
the noise from them, unfortunately.

I know stuff about reducing the noise that's moving through the
duct -
duct silencer, liquid soundproofing you can spray inside the duct.
Etc.
etc. My question though is about the quietest *fan*.

I have no idea which is quietest; however...

1. I have a Broan. Don't recall the CFM but it is maybe 10-12". No
speed control

2. It is about 25' from cooktop

3. The only way we can tell it is running is by looking at the
switch...I used a switch that lights an LED when the switch is on.

Be sure your hood fabricator includes a grease trap - that's just
coarse wire mesh - that is easily removed for cleaning.

--

dadiOH
____________________________

dadiOH's dandies v3.06...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico

Rick Blaine wrote:
(Lacustral) wrote:


I'm planning to use an inline fan for a range hood - I'm going to have the
canopy made by a metal fabricator.


You might want to check what code is before you invest a lot in this setup.
Seems to me there's issues with potential grease buildup on a remote fan for a
range vent that causes this to not be allowed.

--
"Tell me what I should do, Annie."
"Stay. Here. Forever." - Life On Mars

That makes sense, considering what the newspapers here in Red Sox Nation
said a couple of weeks ago when two Boston Firefighters lost their lives
because a burning double ceiling above the kitchen in a Chinese
restaurant collapsed on them.

A fire started above the "upper" of the two ceilings and it was stated
that it may have been burning for a couple of hours before the staff
noticed it and the Fire Department arrived.

The proximate cause was blamed on grease leaking from unsealed joints in
the stove exhaust hood duct and collecting above the higher of the two
ceilings for ages before something touched it off.

The article stated that the restaurant owner had dutifully paid a
"grease cleaning" contractor to service the exhaust system as required,
but whoever did the job skimped on checking the full duct run and/or
didn't refuse to do the job because they couldn't access to the full run
of the duct due to the "double ceiling" situation.

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.

-zero ) wrote:

This is nice and quiet, and IMO, better quality then the others
you'd mentioned.

http://us.exhausto.com/files/pdf/Brochures/3921002.pdf

Their fans seem mostly too big, I need something about 300 CFM. But I
could check out the smallest pizza oven fan. I need something inline
though, that's meant to be inline in the ductwork, I'm not sure if their
fans are inline fans.

What I'm looking for is an inline fan that's engineered to be quiet. You
can have fans pulling a lot of CFM that are quiet. The motor has low RPM,
so that cuts down on motor noise.

Broan says their inline blower has a "low RPM" and is quiet. But they
didn't know what the max RPM is, though the technical support person said she'd
try to find out.

The whole arrangement, having a range hood fan inline in the ductwork in
the attic, is something you can buy as a high-quality range hood. Some of
Broan's range hoods can be used with an external blower. The Broan blower ILB3
is what I was looking at. I know this arrangement isn't contrary to
code. All the code says about kitchen exhaust so far as I know is that
it has to be rigid metal ductwork and a backdraft damper. Yes, I would
put a filter in it. You can buy custom size filters for range hoods
online.

I eat a very lowfat diet and don't use grease for cooking myself, but I
do want to allow for the possibility that someone else might use the
arrangement for cooking with grease. My ceiling over the stove hasn't
gotten dirty, even without a range hood.

Laura

"Lacustral" wrote in message

- about 300 CFM max
- can be speed controlled about all the way to 0.
- doesn't make a hum or whatever when speed controlled.
- Absolutely as quiet as possible.

I've heard that if you compare a small fan with a large fan that's turned
down with a speed control to move the same CFM as the small fan, the large
fan will be quieter.

So, I figure I'd get about a 300 CFM fan and turn it down with a speed
control. Somebody at Broan told me their
fan doesn't have a low-voltage hum when speed controlled. I don't know
how big
of a deal the low-voltage hum is, compared to the noise from the fan
motor.

I know stuff about reducing the noise that's moving through the duct -
duct silencer, liquid soundproofing you can spray inside the duct. Etc.
etc. My question though is about the quietest *fan*.

On Sep 14, 6:58 pm, (Lacustral) wrote:
I'm planning to use an inline fan for a range hood - I'm going to have the
canopy made by a metal fabricator. I'm putting the fan in the attic.
I'm looking for something

- about 300 CFM max
- can be speed controlled about all the way to 0.
- doesn't make a hum or whatever when speed controlled.
- Absolutely as quiet as possible.

I've heard that if you compare a small fan with a large fan that's turned
down with a speed control to move the same CFM as the small fan, the large
fan will be quieter.

Somebody at Fantech told me this wasn't true, that the noise just depends
on the CFM the fan is moving. I don't believe this (she said other very
dubious things), because I've heard elsewhere that a larger fan will be moving
with a lower RPM when it's moving the same amount of air, so it would be
quieter.

So, I figure I'd get about a 300 CFM fan and turn it down with a speed
control. My range is very small and it doesn't need a big fan.

Some fans make a low-voltage hum when you use a speed control on them.
Fantech said their fans do. Someone at Broan told me their inline duct
fan doesn't have a low-voltage hum when speed controlled. I don't know how big
of a deal the low-voltage hum is, compared to the noise from the fan
motor.

What inline fans are quietest? They don't have a standard way of testing
the noise from them, unfortunately.

I know stuff about reducing the noise that's moving through the duct -
duct silencer, liquid soundproofing you can spray inside the duct. Etc.
etc. My question though is about the quietest *fan*.

Laura

Consider an exterior wall fan, then you wont have to worry about
grease in the attic, or noise, heres one:

http://www.rewci.com/faexfa.html

Check in bathroom supplies I will sale you one $50.00
6" OD or 8" presently not sure

"Lacustral" wrote in message
...
-zero ) wrote:

This is nice and quiet, and IMO, better quality then the others
you'd mentioned.

http://us.exhausto.com/files/pdf/Brochures/3921002.pdf

Their fans seem mostly too big, I need something about 300 CFM. But I
could check out the smallest pizza oven fan. I need something inline
though, that's meant to be inline in the ductwork, I'm not sure if their
fans are inline fans.

What I'm looking for is an inline fan that's engineered to be quiet. You
can have fans pulling a lot of CFM that are quiet. The motor has low RPM,
so that cuts down on motor noise.

Broan says their inline blower has a "low RPM" and is quiet. But they
didn't know what the max RPM is, though the technical support person said
she'd
try to find out.

The whole arrangement, having a range hood fan inline in the ductwork in
the attic, is something you can buy as a high-quality range hood. Some of
Broan's range hoods can be used with an external blower. The Broan blower
ILB3
is what I was looking at. I know this arrangement isn't contrary to
code. All the code says about kitchen exhaust so far as I know is that
it has to be rigid metal ductwork and a backdraft damper. Yes, I would
put a filter in it. You can buy custom size filters for range hoods
online.

I eat a very lowfat diet and don't use grease for cooking myself, but I
do want to allow for the possibility that someone else might use the
arrangement for cooking with grease. My ceiling over the stove hasn't
gotten dirty, even without a range hood.

Laura

"Lacustral" wrote in message

- about 300 CFM max
- can be speed controlled about all the way to 0.
- doesn't make a hum or whatever when speed controlled.
- Absolutely as quiet as possible.

I've heard that if you compare a small fan with a large fan that's
turned
down with a speed control to move the same CFM as the small fan, the
large
fan will be quieter.

So, I figure I'd get about a 300 CFM fan and turn it down with a speed
control. Somebody at Broan told me their
fan doesn't have a low-voltage hum when speed controlled. I don't know
how big
of a deal the low-voltage hum is, compared to the noise from the fan
motor.

I know stuff about reducing the noise that's moving through the duct -
duct silencer, liquid soundproofing you can spray inside the duct. Etc.
etc. My question though is about the quietest *fan*.

-zero ) wrote:


This is nice and quiet, and IMO, better quality then the others
you'd mentioned.

http://us.exhausto.com/files/pdf/Brochures/3921002.pdf

I wanted to say thanks for telling me about exhausto. They have inline
fans, they have one that's meant for chimney ventilation which should be
fine for a range hood. It's speed controllable, the guy said it doesn't
make a low-voltage hum. It's almost 500 CFM, which is a little more than
I was thinking of, but actually this much CFM would be useful. I don't
need that much for the range hood, but it'll be useful for times I want
to clean the air out of my house quickly. It's 1600 max RPM, so it's very
quiet. Fantech's fans run at about 2600-3000 max RPM. And I like
exhausto's speed control. It has numbers on the dial, which is useful.

So anyway, this is helpful.

Laura

Any fan rated "Suitable for use over cooking equipment" (within 10' of a
range or cooktop) will NOT be able to be varied in fan speed. For one thing
the motors are usually rated "continuous air over" (meaning that a
continuous airflow of a specific minimum is needed to cool the motor), and
(as others have stated) that duct and fan would become coated with grease is
short time. This is an extreme fire hazard (whether you cook a lot with
grease or now. Just the products of cooking alone can become a problem in a
duct.)

Were you looking for home use or commercial?

For home use, the quietest fans are the ones located on the roof, inside the
exterior weather cover. And they are also the most expensive.


I'm planning to use an inline fan for a range hood - I'm going to have the
canopy made by a metal fabricator. I'm putting the fan in the attic.
I'm looking for something

- about 300 CFM max
- can be speed controlled about all the way to 0.
- doesn't make a hum or whatever when speed controlled.
- Absolutely as quiet as possible.

Dennis ) wrote:
Any fan rated "Suitable for use over cooking equipment" (within 10' of a
range or cooktop) will NOT be able to be varied in fan speed.

That isn't true. There are "infinitely variable" inline fans for range
hood exhaust. Maybe some range hoods come with an "infinite variable" fan
in the hood (you turn a dial to turn the fan down allthe way to 0).
Fantech's fans can be speed controlled to 0.
Exhausto's fan is nice in that it has a door that you can open to clean
it, so it can be cleaned at home with soap and water, they say. I don't
think Fantech's fans are openable. Apparently either BESF or RSIF from
Exhausto is good for inline range hood exhaust.

Laura

I stand corrected. I wasn't aware of these fans (a little more pricy than
what I'm used to seeing in my inspection in the plan's materials.) They do
advertise that they include an infinite speed control for the fan, which
would appear to be exactly what you were looking for. Definitely not your
everyday range hood (as the price would indicate).

That isn't true. There are "infinitely variable" inline fans for range
hood exhaust. Maybe some range hoods come with an "infinite variable" fan
in the hood (you turn a dial to turn the fan down allthe way to 0).
Fantech's fans can be speed controlled to 0.
Exhausto's fan is nice in that it has a door that you can open to clean
it, so it can be cleaned at home with soap and water, they say. I don't
think Fantech's fans are openable. Apparently either BESF or RSIF from
Exhausto is good for inline range hood exhaust.

Laura

replying to Lacustral, Just_tryin_2_help wrote:
Some fans are louder than others. Call a hydroponics store for the best info.
They sell a LOT of inline fans and people want the quietest possible in that
case. You won't need a tremendously hight CFM as you know. With the fan
located in the attic the motor noise will be a non issue, as long as you have
some decent attic insulation AND make sure to put rubber washers between the
fan mount and the house frame to keep vibration noise down. The other main
issue with fan noise is the inlet hole size (the sound of moving air). The
bigger the hole size, the quieter the noise. You can start with 6" ducting and
then put an 8" or 10" expander on the end that opens into the kitchen. This
will greatly reduce sound and not deplete efficiency. Another nice thing about
the hydroponic stores is they will usually open the fan box and plug it in
there in the store so you can hear the noise level. Very kind indeed.

--
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