Dryer vent code in attics

The way I am interpreting the code is that the vent should be rigid metal, supported with a slight back pitch to the dryer. Since its in an attic it should be insulated. The homeowner installed transition foil type duct work from the dryer up into the attic and out the side of the building. There’s a bunch of things wrong here but from everything I’m reading it keeps mentioning concealed walls, ceilings etc where the pipe Is never visible. Would the attic apply as concealed and would this definitely need to be rigid metal only in the attic? Thanks for any help with this

Yes, it should be ridged and insulated. That much flex dryer duct is a fire hazard.

Thanks marcel

The “concealed” requirement is secondary to the “fire hazard” requirement. Smooth rigid ducting allows the movement of air to help scrub the ducting of built-up lint, minimizing the threat of fire. Flex is only allowed so as to facilitate the installation of the appliance, and should be as short as possible… not the full 6 ft stuffed behind the dryer and all kinked up!!

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What everyone else said, but to add, I call that mylar crap out as a combustible material and a potential fire hazard every time I see it regardless of where it’s installed. Sadly, it’ll take a family being killed in a fire as a result of this stuff being used before they ban it.


Thank you Jeffrey

wow Kevin I always call out the plastic but had no idea this stuff was this bad too. Thanks for the heads up

BTW… PVC is smooth and rigid, BUT, it is not allowed due to it’s ability to allow ‘static electricity’ to hold built-up lint tightly, worsening the condition we are attempting to minimize! Ducting should only be made of smooth rigid metal duct work.

Thanks Jeffrey. I have seen pvc used once and I did call it out. Seen some pictures of how bad it clogs because of static.

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