Approved Ducting/ Code For Ducting Bathroom Exhaust Fans To Exterior - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum

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Old 09-08-2015, 04:19 PM   #1
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Approved ducting/ Code for ducting bathroom exhaust fans to exterior

Does anyone know if the "aluminum flex semi-rigid ducting" is OK for ducting a bathroom exhaust. This is if it's to code in Los Angeles or California in general

The above is the type I'm refering too.

Also would this same aluminum semi rigid duct be approved for dryer venting? Thanks

I've been told that the below type of ducting is not approved because it is too flexible and gets lint stuck and obstructs flow:

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Old 09-09-2015, 07:20 PM   #2
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i cant speak to code, sorry.

but ill tell you that you should use insulated duct for the run to roof deck.

say its freezing cold in your attic space. you pump hot steamy shower air into the duct... then you get condensation on the inside of the duct which runs down the sides of the duct back into your fan and possibly into your drywall.

say its hot as all hell in your attic. well then you get heat moving through the duct, then down into the draft damper inside your blower... then slowly heating the damper and re radiating heat into your living space.

its a small amount of heat provided every thing is sealed and working as it should... but its SOME heat. its worth insulating the run of duct.

insulated duct also essentially has 2 layers protecting from air leaking back out into your attic space.

avoid hard elbows. use 5 gore min. elbows with a radius of 1.5 radius to diameter of bend.

strap the duct and secure it well at the roof and at the connection to the fan. the duct should not move what so ever when the fan is energized.
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