Bathroom exhaust vent question

Testarossa214

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.

kbsparky

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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-KB

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Testarossa214

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.

kbsparky

That short of a run should be do-able.

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darren

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.