21x26x4 Air Filter

Improve your indoor air quality with our efficient 21x26x4 air filters designed for optimal performance and longevity

Product List

AirX MERV 16 Furnace Filter for Lennox 21x26x4

AirX MERV 16 Filter 21x26

Airx Filters

Product Review Score

4.54 out of 5 stars

102 reviews

$171.53

Filterbuy 21.5x26x4 MERV 11 Air Filters (2-Pack)

21.5x26x4 MERV 11 Filters

Filterbuy

Product Review Score

4.13 out of 5 stars

181 reviews

$69.98

Atomic MERV 16 Filter for Lennox X6669

Lennox X6669 MERV 16 Filter

Product Review Score

4.89 out of 5 stars

214 reviews

$104.99

21.5x26x4 MERV 11 Air Filters for Pets

MERV 11 Pet Air Filters

Filterbuy

Product Review Score

4.94 out of 5 stars

130 reviews

$99.99

Lennox PCO-20C Replacement Filter X6667 75X67

Lennox PCO-20C Replacement Filter

Product Review Score

4.93 out of 5 stars

206 reviews

$88.03

AirX MERV 16 Furnace Filters for Lennox 2-Pack

AirX MERV 16 Filters 2-Pack

Airx Filters

Product Review Score

4.22 out of 5 stars

181 reviews

$288.64

Lennox X8344 MERV 16 Filter Upgrade Kit 21"x26

Lennox MERV 16 Filter Kit

Product Review Score

4.12 out of 5 stars

89 reviews

$520.00

Filterbuy 21.5x26x4 MERV 13 Air Filters (2-Pack)

21.5x26x4 MERV 13 Filters

Filterbuy

Product Review Score

4.71 out of 5 stars

106 reviews

$80.98

21.5x26x4 MERV 13 Air Filter for Allergies

MERV 13 Allergy Air Filter

Filterbuy

Product Review Score

4.3 out of 5 stars

34 reviews

$64.99

21.5x26x4 MERV 13 Air Filters 4-Pack

MERV 13 Air Filters 4-Pack

Filterbuy

Product Review Score

4.15 out of 5 stars

62 reviews

$151.96

22x26x4 MERV 13 Air Filters (6-Pack)

22x26x4 MERV 13 Filters Pack

Filterbuy

Product Review Score

4.43 out of 5 stars

195 reviews

$227.94

22x26x4 MERV 8 Air Filters (6-Pack)

22x26x4 MERV 8 Filters (6-Pack)

Filterbuy

Product Review Score

4.84 out of 5 stars

218 reviews

$153.96