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Old 01-07-2012, 02:18 PM   #1
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Bathroom exhaust vent question


Hi-
I'm trying to avoid making a hole in my roof for an exhaust vent. Instead, I'd like to run the flex duct over the top of the ceiling joists, down into an existing chase and 90 out the side wall. So, there would be 2-90 degree turns in the duct and the air would flow down before getting outside.
Is this just a really bad idea?
Thanks.

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Old 01-07-2012, 02:32 PM   #2
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Bathroom exhaust vent question


Some questions to consider:

How long is the proposed run of ductwork?

What material are you planning to use for the duct, plastic or metal?

What size is the duct?

What is the CFM rating of the fan?

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Old 01-07-2012, 02:49 PM   #3
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Bathroom exhaust vent question


We're using a broan/nutone standard (cheap) fan and the wall vent kit that they sell with it. I'm not sure of the cfms. The run is about 6 feet across and then about 2 feet down. The duct itself is that flexible slinky- type silver (Mylar?) coated 4" dia. duct.
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Old 01-07-2012, 02:51 PM   #4
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Bathroom exhaust vent question


That short of a run should be do-able.
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Old 01-07-2012, 03:42 PM   #5
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Bathroom exhaust vent question


What type of roof do you have, do you have a gable end. If so you can run out the soffit vent, if you do this I would recommend getting the insulated line if it is going through your attic.
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