4 Inch Depth

20x20x4 MERV 10 AC Furnace 4 Inch Air Filters. 2 Pack. Actual Size: 19-1/2 x 19-1/2 x 3-3/4

Free and Fast Shipping on 2 packs of 20 x 20 x 4 MERV 10 AC & Furnace 4 Inch Air Filters. Actual Size: 19-1/2 x 19-1/2 x 3-3/4.  Filtration Rating: MERV 10, MPR 600-700, FPR 5-6. Protects: Lint, Dust, Pet Dander, Pollen, Dust Mites,...

20x20x4 MERV 8 HVAC Air Filters

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...

20x20x4 MERV 13 HVAC Air Filters

As Low as $22.39 per Filter!      20 x 20 x 4 HVAC Air Filter.  Actual Size: 19-1/2 x 19-1/2 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses,...

20x20x4 MERV 11 HVAC Air Filters

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,...