We have just installed a new Viking range hood and vented it out side.
There are two flappers, one on the outside wall of the house and the
butterfly-type flapper that sit on top of the hood. This one keeps
opening on its own, it seems like there a draft or something. The noise
is driving me insane. I tried to weigh the wings down, but only solved
the problem partially.
Why is this happening and how can this be fixed? I would appreciate
anyone's input on this.
My damper opens when a strong South wind blows over the
roof. The vent is on the North slope of the roof, and
the Bernouilli effect lowers the pressure above the
damper enough cause it to open. I can always tell when
the wind gets up by the sound of the damper slapping.
I suspect that the one on the outside wall is probably
opening at the same time, you just don't hear it. I
don't know that there is much you can do about it.
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