4" 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).

 

20x25x4 MERV 11 - 4 Pack
$99.99

20x25x4 MERV 11 - 4 Pack

19-1/2 x 24-1/2 x 3-3/4

$99.99