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Old 05-20-2014, 11:09 AM   #1
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air sealing bath fan in attic




Just put in a new bath fan going into my attic and i ran it thru the roof and put insulated 6 inch duct. I've built a small box 'around' the fan and air sealed the box and was about to place the top/lid on this box when it occurred to me that 'perhaps' it might not be best. The fan mfg says it's OK to place insulation over the fan as it produces low amounts of heat. BUTTTT, insulation over the fan would allow that "small" amount of heat to dissipate. If I seal in the box then will that trapped heat be a problem. What are the thoughts of you people "out there""




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Old 05-20-2014, 11:18 AM   #2
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air sealing bath fan in attic


I would not have built a box to enclose it.
Spray foam around the base and insulation over it would have been fine.

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Old 05-21-2014, 09:02 AM   #3
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Not disputing your answer, but the mfg says it wont build up heat so why do you think it would be an issue??.. Thanks
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Old 05-21-2014, 09:08 AM   #4
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Not disputing your answer, but the mfg says it wont build up heat so why do you think it would be an issue??.. Thanks
I don't think it will be an issue but you can tell us if it is.
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Old 05-21-2014, 09:18 AM   #5
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Well "certainly", I would like to find out "BEFORE" I do any sealing what the general consensus is here on the forum . If it over heats and either burns out ther motor or causes a fire and burns down the house then that would be a real friggin problem after the fact. So the last thing I would want is to be coming back to this forum and saying "yes', I had to dig out all the insulation , then dig out the box, then replace the fan or replace the burnt down house. sooooo, I don't think "telling you" after an issue might be something I'd like to do.
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Old 05-21-2014, 10:36 AM   #6
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air sealing bath fan in attic


If it's just a fan, the air moving through it will keep the motor cool and the heat will exit via the duct.
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Old 05-21-2014, 10:47 AM   #7
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fan and light , although it has those cfl bulbs ( low heat I would think)
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Old 05-21-2014, 11:58 AM   #8
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Either if fine. We box them out but we are doing a bunch of other boxes so we have everything up there.
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Old 05-21-2014, 06:36 PM   #9
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Well "certainly", I would like to find out "BEFORE" I do any sealing what the general consensus is here on the forum . If it over heats and either burns out ther motor or causes a fire and burns down the house then that would be a real friggin problem after the fact. So the last thing I would want is to be coming back to this forum and saying "yes', I had to dig out all the insulation , then dig out the box, then replace the fan or replace the burnt down house. sooooo, I don't think "telling you" after an issue might be something I'd like to do.
I don't think anybody can predict what will happen. If you thought the box will make the fan over heat you wouldn't put it in. .I think if someone thought the box would make the fan over heat they would advise you not to put it in. I don't think it will make a difference either way.

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