18x20x4 Air Filter

Enhance your indoor air quality with our efficient 18x20x4 air filters designed for optimal performance

Product List

BNX TruFilter 18x20x1 MERV 12 Odor Defense Filters

BNX 18x20x1 Odor Filter

Bnx

Product Review Score

4.93 out of 5 stars

191 reviews

$59.99

Filter King 18x20x1 MERV 11 Air Filter 4-Pack

Filter King MERV 11 Pack

Filter King

Product Review Score

4.42 out of 5 stars

134 reviews

$68.97

20x30 Tolaline CG 1000 Replacement Filter 8-Pack

20x30 Tolaline Filter 8-Pack

Product Review Score

4.49 out of 5 stars

128 reviews

$68.98

Filter King 20x25x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated A/C Furnace Filters | MADE IN USA | Actual Size: 19.5 x 24.5 x .75"

Filter King 20x25x1 Air Filter | 4-PACK | MER...

Filter King

Product Review Score

4.95 out of 5 stars

221 reviews

$33.55

Aerostar 18x20x4 MERV 8 Pleated Air Filters

Aerostar 18x20x4 Air Filters

Aerostar

Product Review Score

4.13 out of 5 stars

108 reviews

$82.37

AIRx MERV 8 Pleated Air Filter 4-Pack

AIRx MERV 8 Filter Pack

Airx Filters

Product Review Score

4.39 out of 5 stars

127 reviews

$42.57

Filterbuy 18x20x4 MERV 8 Air Filter

18x20x4 MERV 8 Filter

Filterbuy

Product Review Score

4.27 out of 5 stars

176 reviews

$42.59

PuroAir MERV 13 Air Filters 18x20x1 - 4 Pack

PuroAir MERV 13 Filters 4 Pack

Product Review Score

4.29 out of 5 stars

230 reviews

$69.00

18x20x4 MERV 13 Air Filters (3-Pack)

18x20x4 MERV 13 Filters - 3 Pack

Filterbuy

Product Review Score

4.82 out of 5 stars

164 reviews

$87.63

Filterbuy 18x20x4 MERV 11 Air Filter for Pets

Pet-Friendly MERV 11 Filter

Filterbuy

Product Review Score

4.99 out of 5 stars

15 reviews

$46.00

Aerostar 18x20x4 MERV 11 Pleated Air Filters

Aerostar 18x20x4 MERV 11 Filters

Aerostar

Product Review Score

4.77 out of 5 stars

122 reviews

$135.99

18x20x4 MERV 8 Air Filters - 3-Pack

18x20x4 MERV 8 Filters - 3-Pack

Filterbuy

Product Review Score

4.52 out of 5 stars

49 reviews

$67.74