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Thread: Common Venting

  1. #1

    Default Common Venting

    Is there such a thing as an inline flapper if you put a Y in the duct to outside so air doesn't go back?

  2. #2
    DIY Senior Member CHH's Avatar
    Join Date
    May 2007
    Denver, CO


    In general, no. A damper such as you describe would be a dangerous obstruction.

    Some appliances have powered dampers to prevent backflow. Those appliances also have controls setup to prevent operation if the damper fails to open completely. I don't know if a powered damper can be used on a shared vent.


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