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Old 02-10-2014, 12:31 PM   #16
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Need advice sizing bathroom fan


Condensation isn't a leak, so sealing won't help. It's the same as when you place a glass of ice water outside on a warm day. The water in the air phase changes due to the temperature and becomes a liquid. Insulation keeps this from happening.

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Old 02-10-2014, 02:35 PM   #17
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Need advice sizing bathroom fan


You can buy the insulated flexible ducting thst joecaption linked to and remove the insulation from it. Then take the insulation and slip it over the rigid ducting.This is a bit more expensive an option due to the wasted materials, but this is what I have done with my rigid exhaust ducting in my attic.
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Old 02-10-2014, 02:43 PM   #18
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I've been curious about this for a while... is duct insulation available at the big box stores, or does one have to special order it, or scavenge as the previous post mentions?
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Old 02-10-2014, 02:54 PM   #19
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Need advice sizing bathroom fan


I found this but it looks like 3" is the max they sell - I didn't see 4".
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Old 02-26-2014, 02:13 PM   #20
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I installed the panasonic whispergreen 130 cfm fan this weekend using two 90 degree 6" elbows, a 6" to 4" reducer, and a short run of vinyl 4" duct in a corkscrew. Yeah, I know, it's a terrible configuration.

Surprisingly, this performs a little better than my previous fan install. But just barely. At the roof, with the fan dialed all the way up to 110 CFM, it opens the vent flap about an inch. The old fan wasn't even able to open the vent flap, so that's good.

However, I've decided it would be a waste to continue running this expensive fan at severely reduced efficiency, so I'll be installing a new 6" roof vent further up the roof. This will allow me to use just one 90 degree elbow and 6" pipe the whole length. Should solve the problem permanently.
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Old 02-26-2014, 02:58 PM   #21
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Need advice sizing bathroom fan


Yeah, you'll get much better results that way.

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