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).

 

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4" Furnace Filters

20x20x4 MERV 11 - 4 Pack Pleated Furnace Filter 20x20x4 MERV 11 - 4 Pack Pleated Furnace Filter

Nominal Size : 20x20x4
Actual Size : 19-1/2 x 19-1/2 x 3-3/4
Part #: UF11-42020-4
MERV Rating: 11
Case: 4
Price: $89.99

 

FREE SHIPPING

Effective for dust, pollen, pet dander, bacteria and mould.
$69.00
4" Furnace Filters

20x20x4 MERV 13 - 6 Pack Pleated Furnace Filter 20x20x4 MERV 13 - 6 Pack Pleated Furnace Filter

Nominal Size : 20x20x4
Actual Size : 19-1/2 x 19-1/2 x 3-3/4
Part #: UF13-42020-6
MERV: 13
Case: 6

Price: $144.99 

*Effective for dust, pollen, pet dander, bacteria and mould.
$112.00
4" Furnace Filters

20x20x4 MERV 8 - 4 Pack 20x20x4 MERV 8 - 4 Pack

Nominal Size: 20 x 20 x 4
Actual Size: 19-1/2 x 19-1/2 x 3-3/4
Part #: UF8-42020-4
MERV: 8
Case: 4
Price: $74.99

 

*Effective for dust, pollen, pet dander, bacteria and mould.
$58.00
4" Furnace Filters

20x20x4 MERV 13 - 4 Pack 20x20x4 MERV 13 - 4 Pack

Nominal Size: 20 x 20 x 4
Actual Size: 19-1/2 x 19-1/2 x 3-3/4
Part #: UF13-42020-4
MERV: 13
Case: 4
Price: $109.99

 

*Effective for dust, pollen, pet dander, bacteria and mold.
$85.00
4" Furnace Filters

20x20x4 MERV 11 - 6 Pack Pleated Furnace Filter 20x20x4 MERV 11 - 6 Pack Pleated Furnace Filter

Nominal Size : 20x20x4
Actual Size : 19-1/2 x 19-1/2 x 3-3/4
Part #: UF11-42020-6
MERV Rating: 11
Case: 6
Price: $99.99

Manufactured: Canada

*Effective for dust, pollen, pet dander, bacteria and mould.
$77.00