Vent Fan Flapper Leak

velvetfoot Posted By velvetfoot, Feb 21, 2007 at 1:54 PM

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  1. velvetfoot

    velvetfoot
    Minister of Fire

    Dec 5, 2005
    8,922
    641
    Loc:
    Sand Lake, NY
    Okay, so why was there a faint odor of smoke in the upstairs bathroom last night? Hmmm, Mrs. VF noted the bathroom seemed to be perenially cool. It turned out the little plastic flapper in the vent fan exhaust was out of place and laying in the duct. You could feel the cold air coming into the house.

    So the house is under vacuum at that point. If it were pressurized could warm air escape from the vent fan ducts-it doesn't take much to move the flapper.

    I can't say I understand this whole vacuum (stack?) effect. If the insert is cold, chances are good there's a downdraft and a cracked open and newspaper needed to get things going the right way up the stack. I have a low power radon fan and have checked its effect on the downdraft when turned off as well as the oil burner and there seems to be none. I looked and found no big leaks (like the attic hatch). It just seems when I open a window the cool air wants to come into the house.
     
  2. Hogwildz

    Hogwildz
    Minister of Fire

    Nov 3, 2006
    7,745
    1,520
    Loc:
    Next to nuke plant Berwick, PA.
    In my old place, I could smell the brbq from out back in the bathroom, due to the same thing happening with the exhaust fan in there. and that flapper worked fine. Never did understand it.
     
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