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).

 

16x20x4 MERV 11 - 3 Pack
$54.99

16x20x4 MERV 11 - 3 Pack

15-1/2 x 19-1/2 x 3-3/4

Nominal Size: 16 x 20 x 4 Actual Size: 15-1/2 x 19-1/2 x 3-3/4 Part #: UF11-41620-3 MERV Rating: 11 # Per Case: 3 Price per Case: $5...

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$54.99
16x25x4 MERV 8 - 4 Pack
$59.99

16x25x4 MERV 8 - 4 Pack

15-1/2 x 24-1/2 x 3-3/4

Nominal Size: 16 x 25 x 4 Actual Size: 15-1/2 x 24-1/2 x 3-3/4 Part #: UF8-41625-4 MERV Rating: 8 # Per Case: 4 Price per Case: $59...

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$59.99
16x25x4 MERV 8 - 3 Pack
$49.99

16x25x4 MERV 8 - 3 Pack

15-1/2 x 24-1/2 x 3-3/4

Nominal Size: 16 x 25 x 4 Actual Size: 15-1/2 x 24-1/2 x 3-3/4 Part #: UF8-41625-3 MERV Rating: 8 # Per Case: 3 Price per Case: $49...

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$49.99
16x25x4 Merv 11 - 4 Pack
$74.99

16x25x4 Merv 11 - 4 Pack

15-1/2 x 24-1/2 x 3-3/4

Nominal Size: 16 x 25 x 4 Actual Size: 15-1/2 x 24-1/2 x 3-3/4 Part #: UF11-41625-4 MERV Rating: 11 # Per Case: 4 Price per Case: $...

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$74.99
16x25x4 MERV 11
$54.99

16x25x4 MERV 11

15-1/2 x 24-1/2 x 3-3/4

Nominal Size: 16 x 25 x 4 Actual Size: 15-1/2 x 24-1/2 x 3-3/4 Part #: UF-4162511-3 MERV Rating: 11 # Per Case: 3 Price per Case: $...

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$54.99
16x25x4 MERV 13
$72.95

16x25x4 MERV 13

15-1/2 x 24-1/2 x 3-3/4

Nominal Size: 16 x 25 x 4 Actual Size: 15-1/2 x 24-1/2 x 3-3/4 Part #: UF13-41625-3 MERV Rating: 13 # Per Case: 3 Price per Case: $...

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$72.95
16x25x4 MERV 13
$89.95

16x25x4 MERV 13

15-1/2 x 24-1/2 x 3-3/4

Nominal Size: 16 x 25 x 4 Actual Size: 15-1/2 x 24-1/2 x 3-3/4 Part #: UF13-41625-4 MERV Rating: 13 # Per Case: 4 Price per Case: $...

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$89.95
20x20x4 MERV 11
$74.99

20x20x4 MERV 11

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: $...

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$74.99
20x20x4 MERV 13
$119.99

20x20x4 MERV 13

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 MERV Rating: 13 # Per Case: 6 Price per Case: $11...

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$119.99
20x25x4 MERV 8
$79.99

20x25x4 MERV 8

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

Nominal Size: 20 x 25 x 4 Actual Size: 19 1/2 x 24 1/2 x 3 3/4Part #: UF8-42025 MERV Rating: 8 # Per Case: 6 Price per Case: $79.99 ...

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$79.99
20x25x4 MERV 11
$99.99

20x25x4 MERV 11

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

Nominal Size: 20 x 25 x 4 Actual Size: 19-1/2 x 24-1/2 x 3-3/4 Part #: UF11-42025-4 MERV Rating: 11 # Per Case: 4 Price per Case: $...

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$99.99
20x25x4 MERV 11
$109.99

20x25x4 MERV 11

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

Nominal Size: 20 x 25 x 4 Actual Size: 19-1/2 x 24-1/2 x 3-3/4 Part #: UF11-42025 MERV Rating: 11 # Per Case: 6 Price per Case: $10...

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$109.99
20x25x4 MERV 13
$139.99

20x25x4 MERV 13

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

Nominal Size: 20 x 25 x 4 Actual Size: 19-1/2 x 24-1/2 x 3-3/4 Part #: UF13-42025 MERV Rating: 13 # Per Case: 6 Price per Case: $13...

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$139.99
24x24x4 MERV 8
$109.99

24x24x4 MERV 8

23-3/8 x 23-3/8 x 3-3/4

Nominal Size: 24 x 24 x 4 Actual Size: 23-3/8 x 23-3/8 x 3-3/4Part #: UF8-42424 MERV Rating: 8 # Per Case: 6 Price per Case: $109.99...

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$109.99
24x24x4 MERV 11
$119.99

24x24x4 MERV 11

23-3/8 x 23-3/8 x 3-3/4

Nominal Size: 24 x 24 x 4 Actual Size: 23-3/8 x 23-3/8 x 3-3/4Part #: UF11-42424 MERV Rating: 11 # Per Case: 6 Price per Case: $119....

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$119.99
24x24x4 MERV 13
$134.99

24x24x4 MERV 13

23-3/8 x 23-3/8 x 3-3/4

Nominal Size: 24 x 24 x 4 Actual Size: 23-3/8 x 23-3/8 x 3-3/4Part #: UF13-42424 MERV Rating: 13 # Per Case: 6 Price per Case: $134....

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$134.99
20x20x4 MERV 8
$69.99

20x20x4 MERV 8

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...

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$69.99
16x20x4 MERV 8
$52.99

16x20x4 MERV 8

15-1/2 x 19-1/2 x 3-3/4

Nominal Size: 16 x 20 x 4 Actual Size: 15-1/2 x 19-1/2 x 3-3/4 Part #: UF8-41620-3 MERV Rating: 8 # Per Case: 3 Price per Case: $52....

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$52.99
16x20x4 MERV 8
$64.99

16x20x4 MERV 8

15-1/2 x 19-1/2 x 3-3/4

Nominal Size: 16 x 20 x 4 Actual Size: 15-1/2 x 19-1/2 x 3-3/4 Part #: UF8-41620-4 MERV Rating: 8 # Per Case: 4 Price per Case: $64....

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$64.99