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n0c7 02-17-2010 12:03 AM

Flex pipe soaked?
We have two fresh air intakes into our furnace room. One runs to the return air ducting and the other to a combustion pot in the floor. They are both the same material seen in the picture below(yellow insulation inside, black plastic outside).

Yesterday we had a temperature change from -10C up to +4C over night. I noticed water leaking from the return air pipe. When I ripped a hole in the black plastic the insulation was soaked. This is definitely from the temperature change where the warm house air is meeting the outside air. My question is, is this normal with such a drastic temperature change? Is the insulation inside this pipe garbage now?

(leaky return air not shown, but exact same 6" pipe material)

yuri 02-17-2010 02:33 PM

I think it is a co-incidence. Probably you had snow sucked into the fresh air pipe (the other is a combustion air pipe) and it melted. Seen that happen with HRVs. You would need to replace it as it may get moldy. Make sure the intake has a screen and snow does not get piled up nearby/swirl and get sucked in. HDepot may sell it as I have bought it from them before.

n0c7 02-17-2010 03:45 PM

We had a sidewalk poured in that area in the fall and we kept the snow cleared all year long. Only chance snow got up in there is if it blew in. :eek:

yuri 02-17-2010 03:57 PM

It got in somehow. Or the exhaust from a clothes dryer or furnace is recirculating and getting sucked in and condensing. Does the vent face due North? I have a customer with a HRV which is getting snow in the intake when a strong North wind blows.

n0c7 02-19-2010 10:24 AM

There is a dryer vent a few feet away but an A/C unit separates them. It's a south facing wall tightly in between two houses. Could very well be snow, but you would think this would melt inside the pipe, not get the insulation in between the pipe and the plastic wet?????

yuri 02-19-2010 02:38 PM

The inner plastic liner is VERY thin and easy to perforate and may have a rip/hole in it from the installers.

okrite 02-20-2010 05:47 PM


okrite 02-20-2010 05:51 PM

cut it again
Hey Yuri,
Cut another piece off one end and put it on the other, least one end will be long enough. :laughing:

yuri 02-20-2010 05:58 PM

Oy. :icon_rolleyes: Now you got me drink/thinkin and I don't want to have a thinkin problem. Wasn't there a county song about that?:laughing:

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