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).

 

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).

 

Filter
Sort by:
4" Furnace Filters

18x24x4 MERV 11 Furnace Filter - 4 Pack 18x24x4 MERV 11 Furnace Filter - 4 Pack

Nominal Size : 18x24x4
Actual Size : 17-1/2 x 23-1/2 x 3-3/4
Part: UF11-41824-4
MERV: 11
Case: 4
Price: $84.99

 

*Effective for dust, pollen, pet dander, bacteria and mould.
$65.00
4" Furnace Filters

18x24x4 MERV 11 - 6 Pack Pleated Furnace Filter 18x24x4 MERV 11 - 6 Pack Pleated Furnace Filter

Nominal Size : 18x24x4
Actual Size : 17-1/2 x 23-1/2 x 3-3/4
Part: UF11-41824-6
MERV: 11
Case: 6
Price: $104.99

 

*Effective for dust, pollen, pet dander, bacteria and mould.
$80.00