Quick view Compare Choose Options 20x20x4 MERV 8 HVAC Air Filters $20.15 As Low as $12.31 per Filter! 20 x 20 x 4 MERV 8 HVAC Air Filters. Actual Dimensions: 19 ½” x 19 ½” x 3 ¾”. Filtration Rating: MERV 8, MPR 600, FPR 5. Blocks and...
Quick view Compare Choose Options 20x20x4 MERV 11 HVAC Air Filters $21.27 As Low as $16.79 per Filter! 20 x 20 x 4 MERV 11 HVAC Air Filters. Actual Dimensions: 19-1/2 x 19-1/2 x 3-3/4. Filtration Rating: MERV 11, FPR 7, MPR 1000. Protection: Smoke, Pet Dander, Pollen, Bacteria,...