I have been hunting for 4" flexible insulated duct for my bathroom exhaust
fan. None of the home centers carry them insulated, only bare aluminum.
Anyone know if there is a source from these or should I just insulate it
Hmm. Never had a problem with condensation. I think
condenstation does form on the cap but then it runs off onto
the roof. Never had anything drip down the pipe. Probably
a lot of factors would enter into the drip or not drip down
Just for the record, if the run from the fan to the outside if more 14 feet
or more, code is that the duct be hard metal, not flex.
IF you are going to insulate it, you will need R5-R6 duct wrap, and it only
comes in a 75 foot long, 5 foot wide roll.....thats alot of duct wrap for a
Home Depot carries flexible insulated 4" duct. At the local one it's up
high where you need to strain to see it. It comes in a plain brown
cardboard box about 8"x7"x36". No pretty pictures or anything.
And yes, it needs to be insulated in cold climes. Even so I've had water
drip back out of the fan when it's really cold (and the run was < 6').
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