exhaust fan with no exhaust

670 Views 3 Replies 3 Participants Last post by boilermaker27, Jan 2, 2016

boilermaker27

Discussion Starter · Jan 1, 2016

I am getting ready to replace the exhaust fan in my main bathroom with a fan/heater combination. When I found the fan the first thing that caught my eye was that the builder did not exhaust the fan to the outside. The fan just exhausted right into the blown insulation. Now I am getting ready to put in the fan/heater and I do want to exhaust it somewhere other than into the insulation and was going to put a 4 inch galvanized line with a 90 degree elbow and just exhaust it into the attic, I can see no other way of doing it. I would put the 90 on a 45 degree angle so as not to vent the moist air straight up where it may possibly trap a bit of moisture, especially in the winter then the galvanized is cold. Any ideas?

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brric

· #2 · Jan 1, 2016

Must be vented through the roof, sidewall or soffit. Insulated ducting should be used.
Are you providing a new circuit for the heater?

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samjg1

· #3 · Jan 1, 2016

The bathroom exhaust can't be vented into the attic. It's against building code.
You don't want to be forcing warm moist air into a cold attic.
It should be vented through either a roof vent or a gable vent.
If roof or gable venting is not possible, a third alternative (not one that I'd choose) is a soffit vent,
http://www.lowes.com/pd_317949-8533...431&pl=1&Ntt=exhaust+soffit+vent#BVRRWidgetID .

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boilermaker27

Discussion Starter · #4 · Jan 2, 2016

I guess the builder was lazy and didn't duct it anywhere except into the insulation. Will look and see the best way, but definitely not through the roof. As for the circuit. I have a 20 amp circuit breaker, 12/2 wire, and a GFCI for the heater.

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