Inadequate Backflow Prevention‏

Inadequate Backflow Prevention‏

Many folks ask how you can tell if you have an in adequate backflow prevention flap on your exhaust fan?
We've talked about this flap already. This is located at the end of the duct as part of the weather hood assembly. It allows exhaust air to go out through the hood but stops backflow. The flap may be stuck open or closed, broken, or missing.
If the flap remains open, cold air can flow back into the house through the ductwork and exhaust fan. If this flap is stuck in the closed position, we won't be able to exhaust the warm, moist air.

When outside, if the exhaust hood is assessable, operate the flap with your finger, lift the flap out and let go of it to see if it drops back into place and closes appropriately. If the flap is difficult to open or does not close properly, repair or replacement is in order.

HAPPY REHABBING!!!

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