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Old 10-12-2012, 01:12 PM   #1
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What is the best way to run duct ...

from the bath fan to the outside?

We are converting a bedroom into a master bath ... size is 10x11. The room is at the north corner of the house on the ground floor. We live in NW Arkansas. The house is a 60's ranch with a full basement. 8' interior walls, 2x4 construction, brick veneer, hip roof, 18" soffits ... we have soffit vents and a ridge cap vent to vent the attic.

We are putting in a 150 CFM bath fan on a timer switch. I'd like to duct it to the soffit about 6' away. That OK? If so: 1) should we use insulated flexible duct?, 2) do we need a backdraft damper?, 3) any suggestions on what kind or brand of termination hood to use at the soffit?.

Thanks for your help in advance.


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Old 10-12-2012, 02:36 PM   #2
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it should be piped through the roof. use solid pipe and insulate it.


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Old 10-12-2012, 03:03 PM   #3
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Thanks for the reply, DannyT.

Disappointed that I have to punch a hold in my roof instead of my soffit.

Can you recommend a particular termination hood for the roof?
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Old 10-12-2012, 03:47 PM   #4
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The best way is to run to the pipe to the soffit with a gradual slope that will drain the condensation. There will still be some vertical pipe there at the fan but not much. Use solid pipe if possible. Check with the fan manufacturer for a soffit termination kit. At minimum you'll need a screen for insect control and to keep Starlings out. Since cold air doesn't rise don't be too concerned about it entering a soffit vent and back drafting. Most fans have a built in back draft damper even though many don't amount to much.
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