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Air infiltration through kitchen hood exhaust duct

Griffin728 | Posted in General Questions on

Hello, I’m sure this has been covered, but I must be searching on the wrong terms. My newly installed Broan 350 cfm hood vent is back drafting exterior air into the house when it’s off. Now that it’s below zero F, it’s also collecting condensation. There is only about an 18 inch run of duct between the inside and outside. Is there anything I can do to help the situation, short of replacing the whole hood?


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