Bathroom fan vent duct


Old 09-30-18, 05:50 AM
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Bathroom fan vent duct

I just finished installing 4" rigid pipe for the dryer vent to outside.
the current bathroom fan is a 6" pipe that just vents into the crawl space. Can I use plastic flex duct and reduce it to 3"? What is the cheapest code compliant way for bathroom venting?
Old 10-01-18, 01:53 PM
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Join Date: Dec 2005
Location: VA
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Run the same size duct that is coming off of the fan. Also needs to vent outside and not into a crawlspace.

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