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).

 

20x20x4 MERV 11 - 4 Pack
$74.99

20x20x4 MERV 11 - 4 Pack

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

Nominal Size: 20 x 20 x 4
Actual Size: 19-1/2 x 19-1/2 x 3-3/4
Part #: UF11-42020-4
MERV Rating: 11
# Per Case: 4
Price per Case: $74.99

Manufactured: Canada

*Effective for dust, pollen, pet dander, bacteria and mould.
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$74.99
20x20x4 MERV 8 - 4 Pack
$69.99

20x20x4 MERV 8 - 4 Pack

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

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 Rating: 8
# Per Case: 4
Price per Case: $69.99

Manufactured: Canada

*Effective for dust, pollen, pet dander, bacteria and mould.
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$69.99
20x20x4 MERV 13 - 4 Pack
$119.99

20x20x4 MERV 13 - 4 Pack

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

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 Rating: 13
# Per Case: 4
Price per Case: $119.00

Manufactured: Canada

*Effective for dust, pollen, pet dander, bacteria and mould.
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$119.99
20x20x4 MERV 11 - 6 Pack
$99.99

20x20x4 MERV 11 - 6 Pack

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

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

Manufactured: Canada

*Effective for dust, pollen, pet dander, bacteria and mould.
View full details
$99.99