Why ducts are hanged with space between joists?

Discussion in 'HVAC' started by python01, May 21, 2011.

  1. May 21, 2011 #1

    python01

    python01

    python01

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    I wonder why there is always space left between duct and joists in the basement?
    Would it be ok to mount duct right against the joists if it is being replaced? Or is it due to vibration from the furnace or some other reason?
     
  2. May 22, 2011 #2

    paul52446m

    paul52446m

    paul52446m

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    You are right, it is because of vibration. People walking across the floor will make the ducts rattle , so never put the ducts up to the joist. Paul
     
  3. May 22, 2011 #3

    joecaption

    joecaption

    joecaption

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    And any vibration in the blower system in the air exchanger will be applified like a speaker box.
     

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