4 Inch Furnace Filters

Improve the air quality in your home with a 4 inch furnace filter.

At United Filter, we know that you want only the best for your family, and that's why we offer 4 inch furnace filters to our Canadian and American customers. We have multiple size options to fit your needs, so you can be sure they'll fit seamlessly into your home's HVAC system and provide extended life, reduced energy consumption, and enhanced allergen control.

Our 4 inch furnace filters are designed with a dual-layer design that improves filtration efficiency while extending replacement intervals. We also have customisation options available so you can ensure that these filters fit seamlessly into your current HVAC system without disrupting operation or performance of any kind.

Stop wasting money on frequent maintenance! Get a 4 inch furnace filter today!

Improve the air quality in your home with a 4 inch furnace filter.

At United Filter, we know that you want only the best for your family, and that's why we offer 4 inch furnace filters to our Canadian and American customers. We have multiple size options to fit your needs, so you can be sure they'll fit seamlessly into your home's HVAC system and provide extended life, reduced energy consumption, and enhanced allergen control.

Our 4 inch furnace filters are designed with a dual-layer design that improves filtration efficiency while extending replacement intervals. We also have customisation options available so you can ensure that these filters fit seamlessly into your current HVAC system without disrupting operation or performance of any kind.

Stop wasting money on frequent maintenance! Get a 4 inch furnace filter today!

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4 Inch Furnace Filters

16x20x4 MERV 11 - 6 Pack Pleated Furnace Filter 16x20x4 MERV 11 - 6 Pack Pleated Furnace Filter

Nominal Size : 16x20x4
Actual Size : 15-1/2 x 19-1/2 x 3-3/4
Part #: UF11-41620-6
MERV Rating: 11
Case: 6
Price: $114.99

 

$85.00
4 Inch Furnace Filters

16x25x4 MERV 11 - 4 Pack Pleated Furnace Filter 16x25x4 MERV 11 - 4 Pack Pleated Furnace Filter

Nominal Size : 16x25x4 
Actual Size : 15-1/2 x 24-1/2 x 3-5/8
Part #: UF11-41625-4
MERV Rating: 11
Case: 4
Price: $74.99

 

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Effective for dust, pollen, pet dander, bacteria and mould.

Exact Replacement for 3M Filtrete Furnace Filter.

$55.00
4 Inch 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.
$66.00
4 Inch Furnace Filters

20x25x4 MERV 11 - 4 Pack Pleated Furnace Filter 20x25x4 MERV 11 - 4 Pack Pleated Furnace Filter

Nominal Size : 20x25x4
Actual Size : 19-1/2 x 24-1/2 x 3-3/4
Part #: UF11-42025-4
MERV Rating: 11
Case: 4
Price: $84.99

                                               FREE SHIPPING


Effective for dust, pollen, pet dander, bacteria and mould.
$63.00
4 Inch Furnace Filters

16x20x4 MERV 11 - 3 Pack Pleated Furnace Filter 16x20x4 MERV 11 - 3 Pack Pleated Furnace Filter

Nominal Size : 16x20x4
Actual Size : 15-1/2 x 19-1/2 x 3-3/4
Part #: UF11-41620-3
MERV Rating: 11
Case: 3
Price: $69.99

 

$52.00
4 Inch Furnace Filters

16x25x4 MERV 8 - 6 Pack 16x25x4 MERV 8 - 6 Pack

Nominal Size: 16 x 25 x 4
Actual Size: 15-1/2 x 24-1/2 x 3-3/4
Part #: UF8-41625-6
MERV: 8
Case: 6
Price: $104.99
$77.00
4 Inch Furnace Filters

16x25x4 MERV 8 - 4 Pack Pleated Furnace Filter 16x25x4 MERV 8 - 4 Pack Pleated Furnace Filter

Nominal Size : 16x25x4
Actual Size : 15-1/2 x 24-1/2 x 3-3/4
Part #: UF8-41625-4
MERV : 8
Case: 4
Price: $92.99

 

*Effective for dust, pollen, pet dander, bacteria and mold.
$69.00
4 Inch Furnace Filters

16x25x4 MERV 8 - 3 Pack Pleated Furnace Filter 16x25x4 MERV 8 - 3 Pack Pleated Furnace Filter

Nominal Size : 16x25x4
Actual Size : 15-1/2 x 24-1/2 x 3-3/4
Part #: UF8-41625-3
MERV Rating: 8
Case: 3
Price: $69.99

 

*Effective for dust, pollen, pet dander, bacteria and mold.
$52.00
4 Inch Furnace Filters

16x25x4 MERV 11 - 3 Pack Pleated Furnace Filter 16x25x4 MERV 11 - 3 Pack Pleated Furnace Filter

Nominal Size : 16x25x4
Actual Size : 15-1/2 x 24-1/2 x 3-5/8
Part #: UF11-4162511-3
MERV Rating: 11
Case: 3
Price: $69.99

 

* Exact Replacement for 3M Filtrete.
$52.00
4 Inch Furnace Filters

16x25x4 MERV 13 - 3 Pack Pleated Furnace Filter 16x25x4 MERV 13 - 3 Pack Pleated Furnace Filter

Nominal Size : 16 x 25 x 4
Actual Size : 15-1/2 x 24-1/2 x 3-5/8
Part #: UF13-41625-3
MERV: 13
Case: 3
Price: $114.99

 

*Effective for dust, pollen, pet dander, bacteria and mold.
$71.00
4 Inch Furnace Filters

16x25x4 MERV 13 - 4 Pack Pleated Furnace Filter 16x25x4 MERV 13 - 4 Pack Pleated Furnace Filter

Nominal Size : 16x25x4
Actual Size : 15-1/2 x 24-1/2 x 3-5/8
Part: UF13-41625-4
MERV: 13
Case: 4
Price: $139.99

 

*Effective for dust, pollen, pet dander, bacteria and mould.
$103.00
4 Inch 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.
$107.00
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