4 Inch Filters

24x24x4 MERV 13 HVAC Air Filters

As Low as $22.39 per Filter!   24 x 24 x 4 HVAC Air Filter.  Actual Size: 23-3/8 x 23-3/8 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses, smoke, smog,...

20x25x4 MERV 13 HVAC Air Filters

As Low as $22.39 per Filter!   20 x 25 x 4 HVAC Air Filter.  Actual Size: 19-1/2 x 24-1/2 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses, smoke, smog,...

20x24x4 MERV 13 HVAC Air Filters

As Low as $22.39 per Filter! 20 x 24 x 4 HVAC Air Filter.  Actual Size: 19-3/8 x 23-3/8 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses, smoke, smog, lead dust,...

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,...

18x24x4 MERV 13 HVAC Air Filters

As Low as $22.39 per Filter!    18 x 24 x 4 HVAC Air Filter.  Actual Size: 17-3/8 x 23-3/8 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses, smoke,...

16x25x4 MERV 13 HVAC Air Filters

As Low As $20.15 Per Filter!  16 x 25 x 4 HVAC Air Filter.  Actual Size: 15-1/2 x 24-1/2 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses, smoke, smog, lead...

16x20x4 MERV 13 HVAC Air Filters

As Low As $20.15 Per Filter!   16 x 20 x 4 HVAC Air Filter.  Actual Size: 15-1/2 x 19-1/2 x 3-3/4.  Filter Rating: MERV 13 | FPR 10 | MPR 2200.  Protects: Pollen, dirt, dust, pet dander, viruses, smoke, smog,...

12x24x4 MERV 13 HVAC Air Filters

  As Low As $20.15 Per Filter!   12 x 24 x 4 HVAC Air Filter.   Actual Size: 11-1/2 x 23-1/2 x 3-3/4.   Filter Rating: MERV 13 | FPR 10 | MPR 2200.   Protects: Pollen, dirt, dust, pet dander, viruses, smoke,...