“is there something that keeps air from coming in through the downdraft from outside? we just moved into a house with a similar unit and there is a draft coming into the house from the exhaust”
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Where your exhaust vent exist the building there should be a vent cap with a spring loaded dampener . It opens when positive pressure from the blower is on and automatically closes when you turn off the fan. Can be bought at any Lowes or Depot
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