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NJHoo

Joined: 8/14/98 Posts: 32010
Likes: 3771


HVAC puzzle for the DIY group


A few weeks ago, when the furnace would turn on, I would hear a metallic bang, sort of like someone giving a tap on a metal plenum in the air system. It was a single "bang" at each startup. I finally figured it out, but would like to hear your guesses.

Posted: 02/12/2020 at 11:10AM



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Current Thread:
 
  
HVAC puzzle for the DIY group -- NJHoo 02/12/2020 11:10AM
  You were all close -- NJHoo 02/12/2020 12:27PM
  The other return was just 12 x 12" -- NJHoo 02/12/2020 1:44PM
  Re: The other return was just 12 x 12 -- Trigon 02/13/2020 03:41AM
  The hi-tech filters do not let enough air-flow. ** -- Guy Caballero 02/12/2020 1:00PM
  Either metal expansion when the duct got hot, -- Trigon 02/12/2020 11:30AM
  Bang from the furnace or bang from a duct somewhere? ** -- MaizeAndBlueWahoo 02/12/2020 11:29AM
  Duct expansion? ** -- JohnHoo2 02/12/2020 11:15AM

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