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  1. #1
    Join Date
    Nov 2008
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    4

    Question Cranking noise (clunks) when air heater comes on.

    We recently moved into a 31 yr old ranch house and this problem is driving us crazy.

    Every time the heater comes on (and now a days it is frequent) we get these clunks in our master bedroom near the air outlet. I also found it is there at various other spots as well, throughout the house. They continue to come even after the heater is off (as long as 4-5 min. after it is stopped)

    I went to the basement (70 % finished) to see where is coming from and I can see it is coming from the end of the big pipe that is going into the room floor.

    How can I dampen or eliminate this noise?? Is this a common occurrence?

    Your help is much appreciated - Thanks in advance.

  2. #2
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Cranking noise (clunks) when air heater comes on.

    Most likely it is the expansion and contraction of the ductwork against framing members.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Nov 2008
    Posts
    4

    Exclamation Re: Cranking noise (clunks) when air heater comes on.

    Thanks for your reply.

    Any remedy on reducing or eliminating it?

    Thanks again,

  4. #4
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Cranking noise (clunks) when air heater comes on.

    Isolation is the only remedy. Any place you see framing touching the duct, force a little fiberglass insulation in or enlarge the hole. You don't need much, you just need to NOT have contact with the duct.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  5. #5
    Join Date
    Jan 2008
    Posts
    731

    Default Re: Cranking noise (clunks) when air heater comes on.

    Quote Originally Posted by mpathak View Post
    We recently moved into a 31 yr old ranch house and this problem is driving us crazy.

    Every time the heater comes on (and now a days it is frequent) we get these clunks in our master bedroom near the air outlet. I also found it is there at various other spots as well, throughout the house. They continue to come even after the heater is off (as long as 4-5 min. after it is stopped)

    I went to the basement (70 % finished) to see where is coming from and I can see it is coming from the end of the big pipe that is going into the room floor.

    How can I dampen or eliminate this noise?? Is this a common occurrence?

    Your help is much appreciated - Thanks in advance.
    Good advice here:

    How to Quiet a Noisy Forced-Air System: http://www.thisoldhouse.com/toh/vide...047185,00.html

    Quieting Noisy Ducts: http://www.thisoldhouse.com/toh/askt...131823,00.html

  6. #6
    Join Date
    Nov 2008
    Posts
    4

    Thumbs up Re: Cranking noise (clunks) when air heater comes on.

    Thank you again A. Spruce and Blue Ridgeparkway..This is great advice..Next stop Lowes - Fiberglass insulation and the rubber pads..

    Thanks you!

  7. #7
    Join Date
    Jan 2008
    Posts
    731

    Default Re: Cranking noise (clunks) when air heater comes on.

    you are welcome and good luck.

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