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#1
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Installing bath exhaust fan
I am installing two Panasonic bath exhaust fans - one FV-08VQ3 and one
FV-11VQ3. Because of the difference in size and location of the new fan, I have to extend the existing 4" sheet metal conduit to the new fan. They are about 30" apart. Should I use new sheet metal conduit to bridge this 30" or should I use a "coiled" looking flex conduit? or PVC pipes? I need to cut the existing sheet metal pipe back a bit, what is the best way to do this? The attic space is tight I am pretty much limited to hand tools. Also, I traced the conduit and found that all the bath exhaust conduit do not exit the roof, but simply extended to the roof overhang and sat on top of soffit openings. Is that ok? When the fan is on and moist air is drawn, part of it will exit the soffit vent, but part of it will go inside the attic. Is this acceptable? Thanks, MC |
#2
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Installing bath exhaust fan
On Jun 1, 10:17*pm, "MiamiCuse" wrote:
I am installing two Panasonic bath exhaust fans - one FV-08VQ3 and one FV-11VQ3. Because of the difference in size and location of the new fan, I have to extend the existing 4" sheet metal conduit to the new fan. *They are about 30" apart. *Should I use new sheet metal conduit to bridge this 30" or should I use a "coiled" looking flex conduit? *or PVC pipes? The flex pipe is widely used for these applications because it's easy to work with. That's what I would use. I need to cut the existing sheet metal pipe back a bit, what is the best way to do this? *The attic space is tight I am pretty much limited to hand tools. Tin snips. Also, I traced the conduit and found that all the bath exhaust conduit do not exit the roof, but simply extended to the roof overhang and sat on top of soffit openings. *Is that ok? *When the fan is on and moist air is drawn, part of it will exit the soffit vent, but part of it will go inside the attic. *Is this acceptable? No, the fan vent should have a direct exit. If it's just laid on top of the soffit, as you pointed out, a considerable amount, maybe even most of the air, is going to go back into the attic. Plus, the soffit area is going to be cold, perfect for condensation to occur. Probably much less of an issue in Maimi than northern climates, but I'd still do it right. Plus, I would expect your code would require it to be properly vented. Thanks, MC |
#3
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Installing bath exhaust fan
Also, I traced the conduit and found that all the bath exhaust conduit do
not exit the roof, but simply extended to the roof overhang and sat on top of soffit openings. *Is that ok? *When the fan is on and moist air is drawn, part of it will exit the soffit vent, but part of it will go inside the attic. *Is this acceptable? Thanks, MC It's one of those things that's not right, but its done all the time. At least you pointed it out of a soffit. Most people just empty it into the attic. What I did is use rigid duct and ended it right by my attic fan on top of the roof which is already open. At least it goes right up outside. I really did not feel like putting a hole in my roof. |
#4
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Installing bath exhaust fan
On Jun 1, 9:17*pm, "MiamiCuse" wrote:
I am installing two Panasonic bath exhaust fans - one FV-08VQ3 and one FV-11VQ3. Because of the difference in size and location of the new fan, I have to extend the existing 4" sheet metal conduit to the new fan. *They are about 30" apart. *Should I use new sheet metal conduit to bridge this 30" or should I use a "coiled" looking flex conduit? *or PVC pipes? Flex saves a lot of hassles at the cost of slightly less efficiency. I need to cut the existing sheet metal pipe back a bit, what is the best way to do this? *The attic space is tight I am pretty much limited to hand tools. Sheet metal pros use double cut aviation snips. Wiss is a good brand. If all you need to trim is an inch or so, then conventional aviation snips are OK. Also, I traced the conduit and found that all the bath exhaust conduit do not exit the roof, but simply extended to the roof overhang and sat on top of soffit openings. *Is that ok? *When the fan is on and moist air is drawn, part of it will exit the soffit vent, but part of it will go inside the attic. *Is this acceptable? No. Joe |
#5
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Installing bath exhaust fan
"Joe" wrote in message
... On Jun 1, 9:17 pm, "MiamiCuse" wrote: I need to cut the existing sheet metal pipe back a bit, what is the best way to do this? The attic space is tight I am pretty much limited to hand tools. Sheet metal pros use double cut aviation snips. Wiss is a good brand. If all you need to trim is an inch or so, then conventional aviation snips are OK. Thanks Joe. Is this one I can use: http://www.northwaysmachinery.com/pr...%20Duct%20Snip Thanks, MC |
#6
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Installing bath exhaust fan
On Jun 6, 10:42*am, "MiamiCuse" wrote:
snip . Thanks Joe. *Is this one I can use: http://www.northwaysmachinery.com/pr...emNumber=Wiss%... That's the one in my tool box. It helps to drill a 1/4" hole to start the cut with the center blade. On soft thin aluminum the center blade can sometimes be forced into the work to start the cut. Double cuts must never be used for close trimming or edge cuts. Their special use is on sheet metal with a good bit of material on both sides of the outer blades. They are the only way to get clean cuts away from the ends of vent pipe. Have fun. Joe |
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