Icicles forming on the outside of the house from stove hood vent-help!
Wendy on Apr 03, 2018You re probably getting back drafting. Where the cold air from outside is travelling in from the exterior vent and mixing with the warm air from the inside your house., the warm and cold causing moisture and then the cold air is SO cold today that it is freezing the condensation that forms. First thing to do is check that the exterior vent outside is closing properly. The flaps on the cheap builders ones can freeze open and it lets the cold air right in.Helpful Reply
Kelly on Apr 05, 2018If I understood you right, your vent exits through/ near the roof, right? Your vent stack may not be high enough to pull the vented air/ moisture up and away from the house, causing that condensation to come back down. Check the recommendations for vent stack heights and you may be able to just extend your stack (usually above the roof line) and properly draw that up and away.Helpful Reply
William on Apr 05, 2018I agree with Wendy. The outside vent should have a flapper that opens when the hood is on. It more likely is not closing when the hood is off. If it does not have a flapper then you need to replace the vent with one that has a flapper.Helpful Reply
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