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http://home.howstuffworks.com/how-to-troubleshoot-a-forced-air-distribution-system1.htm

the damper (活门), is only 4-6 inches away from the floor register (air out-let) .each air out-let have one damper.it is uesd for room's air balance.
to check, remove the floor register, weare a pair of glove ( the damper is a peice of thin and shape matel),put your hand into the air duct, till feel the damper (活门), then check it if loose,if it is loose. when the blower fan is running,the damper flaping back and forth, the noise is form it.
You can move it to open position more. make sure it is not blocking too much of the air flow
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Replies, comments and Discussions:

  • 枫下家园 / 美丽家居 / 急问: 一个卧房的暖风通道在送暖风后老发出砰砰的响声, 可能是什么原因? 谢谢.
    • Check 暖风通道中的活门,
      • how to check? I have same issue.
      • 看了一下, 没看出问题, 能具体说说么? 多谢.
    • http://home.howstuffworks.com/how-to-troubleshoot-a-forced-air-distribution-system1.htm
      the damper (活门), is only 4-6 inches away from the floor register (air out-let) .each air out-let have one damper.it is uesd for room's air balance.
      to check, remove the floor register, weare a pair of glove ( the damper is a peice of thin and shape matel),put your hand into the air duct, till feel the damper (活门), then check it if loose,if it is loose. when the blower fan is running,the damper flaping back and forth, the noise is form it.
      You can move it to open position more. make sure it is not blocking too much of the air flow
      • 要是松了怎么办?一个卧室的活门有些松,可以左右移位。 要像拧劲就只能旋转到树起来的位置,可这样就把风都挡住了。
        • Try this.
          拧劲就只能旋转到树起来的位置, under this condition, keep moving the damper(Force it open) untill it has 25% open , then it won't blocking the air flow. there is no better way to fixed it. if the room is on second floor of ur home. if the room on 1st floor. you can fixed it in basement by tighen up the screw. good luck