4 Inch Air Filters

20x25x4 MERV 10 AC Furnace 4 Inch Air Filters. 2 Pack. Actual Size: 19-1/2 x 24-1/2 x 3-3/4

Fast Free Shipping on 20 x 25 x 4 MERV 10 AC & Furnace 4 Inch Air Filters.  Actual Size: 19-1/2 x 24-1/2 x 3-3/4.  Filtration Rating: MERV 10, MPR 600-700, FPR 5-6.  Protects: Lint, Dust, Pet Dander,...

24x24x4 MERV 11 HVAC Air Filters

As Low as $16.79 per Filter! 24 x 24 x 4 MERV 11 HVAC Air Filters.  Actual Dimensions: 23-3/8 x 23-3/8 x 3-3/4.   Filtration Rating: MERV 11, FPR 7, MPR 1000.  Protection: Smoke, Pet Dander, Pollen, Bacteria, Dust Mites,...