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  1. #1
    Join Date
    Dec 2012
    Posts
    62

    What are the most obtainable common 4" Media filter sizes ?

    From my own unscientific survey, it seems that the 20x20x4" one are most obtainable at the usual hardware stores. Then maybe 16x20 and 16x25 ?????

  2. #2
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    5,657
    20x25x4,16x25x4 and 20x20x4 are the most commom

  3. #3
    Join Date
    Dec 2012
    Posts
    62
    Quote Originally Posted by jtrammel View Post
    20x25x4,16x25x4 and 20x20x4 are the most commom
    Thanks "j". Just wondering for a new system. 20x20 may not fit with existing return and furnace, but installer said probably 16x25 or 16x20 for the 4". Interestingly, one hardware store I called said that the 4" filters are either slightly under 4" or about 4 3/16". So is the typical installed filter cabinet/holder going to accommodate these differences ?

  4. #4
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,350
    Quote Originally Posted by mixer440 View Post
    Thanks "j". Just wondering for a new system. 20x20 may not fit with existing return and furnace, but installer said probably 16x25 or 16x20 for the 4". Interestingly, one hardware store I called said that the 4" filters are either slightly under 4" or about 4 3/16". So is the typical installed filter cabinet/holder going to accommodate these differences ?
    If you search online there are typically generic replacement media filters that will fit your cabinet. Some may fit better than others, so it's important to look at the "true" dimensions and compare them to the OEM replacement filter.

  5. #5
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    5,657
    Yes, some are nominally 4" (~3 3/4") or 5" (~4 1/2")

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