Bathroom fan vent duct

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Old 09-30-18, 04:50 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?
 
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Old 10-01-18, 12:53 PM
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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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