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I have a problem on a two story apt. in the northwest. We are getting cups of water down thru the range hood’s. The hood’s are plumbed (stacked) together. The duct work is 4″x 10″ and transitions to 8″ thru the roof. I suspect condensation, even though it seems like alot of water. Should I wrap the 8″ pipe in the attic with insulation? Or install a damper to close off cold air? Thank you, Andre’ Ciais, Republic, Washington
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Seems like a large amount of water to me, too, although if they're commercial type gas ranges, they can put out a lot of water vapor in the combustion gases.
I think you need top pin down the source before you devise a remedy.
Any rain lately? It could be a leak.
Is the water associated with any particular events? Any time periodicity? (Did I make that word up?)
There should be a damper on it already.
*Andre'J. CiaisThey are electric ranges. Yes, there has been rain. The problem has occured without rain. I have been in the attic have not seen any signs of leakage. The roof vents have caps. So, I do not think they are leaking. There is a damper right at the hood.
*Darn, I was hoping they were gas, because I just found some info on water vapor in comubustion gases: "Gas combustion produces water vapor as a byproduct, in known quantities: 100,000 Btu of gas puts out about 1.1 gallons of water."This was from the Journal of Light Construction article on "Vent-free" heaters.Of course, maybe the occupants are cooking a lot of pasta or other high vapor producing dishes, which couyld put a lot of vapor up there.I'd say you're on the right track to increase insulation to prevent condensation.