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NJHoo

Joined: 8/14/98 Posts: 32006
Likes: 3766


You were all close


The large air return filter is in front of a large metal box that connects to a second return and then on to the flexible round return. When I installed a new filter on December 1, I used a Merv 13 rated filter for the first time. It only took two months for it to collect enough fine particles to create enough resistance to air flow that the startup caused the metal box to flex with a bang. New filter and it stopped

(In response to this post by NJHoo)

Posted: 02/12/2020 at 12:27PM



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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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