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4 inch Furnace Filters

4" replacement furnace filters are available in many standard and non-standard sizes. Simply select your size from the drop down box below to choose your filter size. Keep in mind that length and width are reversible (i.e. a 15x20x4 is the same as a 20x15x4).

  • Furnace Filters 16x20x4

  • Furnace Filters 16x25x4

  • Furnace Filters 20x20x4

  • Furnace Filters 20x25x4

  • Furnace Filters 24x24x4

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United Filter Company Ltd.

#6 - 2624 Royal Windsor Drive Mississauga, ON L5J 1K7

Monday-Friday: 9am to 5pm  



905-403-0160  Local
844-834-5837  Toll Free

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