18 Inch Width

18x18x1 MERV 11 HVAC Air Filters

As Low As $6.59 Per Filter!  18 x 18 x 1 MERV 11 Air Filters for your HVAC System.   Actual Size: 17-3/4 x 17-3/4 x 3/4.   Filtration Rating: MERV 11, FPR 7, MPR 1000.   Protection: Smoke, Pet Dander, Pollen, Bacteria,...

18x18x1 MERV 13 HVAC Air Filters

As Low As $7.33 Per Filter!   18 x 18 x 1 MERV 13 Air Filter for A/C and Furnace.  Actual Dimensions: 17-3/4 x 17-3/4 x 3/4.  Filter Rating: MERV 13, FPR 10, MPR 2200.  Our premium 18x18x1 MERV 13 filter will...

18x18x1 MERV 8 HVAC Air Filters

As Low As $5.39 Per Filter!  18 x 18 x 1 MERV 8 HVAC Air Filters.  Actual Size: 17 3/4" x 17 3/4 x 3/4”.  Filtration Rating: MERV 8, MPR 600, FPR 5.  Defends: Lint, Dust, Pet Dander, Pollen, Dust Mites, &...

18x18x2 MERV 13 HVAC Air Filters

As Low As $11.97 Per Filter! 18 x 18 x 2 Air Conditioner and Furnace Filter.  Actual Size: 17-3/4 x 18-3/4 x 1-3/4.  Filtration Rating: MERV 13, FPR 10, MPR 2200.  Protects: Pollen, dirt, dust, pet dander, virus...

18x18x2 MERV 8 HVAC Air Filters

As Low As $5.83 Per Filter!   18 x 18 x 2 MERV 8 HVAC Air Filters.   Actual Dimensions: 17 3/4" x 17 3/4” x 1 3/4”.  Filtration Rating: MERV 8, MPR 600, FPR 5.  Captures: Lint, dust, pet...

18x20x1 MERV 11 HVAC Air Filters

As Low As $6.59 Per Filter!  18 x 20 x 1 MERV 11 Air Filters for your HVAC System.   Actual Size: 17-3/8 x 19-1/2 x 3/4.   Filtration Rating: MERV 11, FPR 7, MPR 1000.   Protection: Smoke, Pet Dander, Pollen, Bacteria,...

18x20x1 MERV 13 HVAC Air Filters

As Low As $7.33 Per Filter!   18 x 20 x 1 MERV 13 Air Filter for A/C and Furnace.  Actual Dimensions: 17-3/8 x 19-1/2 x 3/4.  Filter Rating: MERV 13, FPR 10, MPR 2200.   Our premium 18x20x1 MERV 13 filter will...

18x20x1 MERV 8 HVAC Air Filters

As Low As $5.39 Per Filter!  18 x 20 x 1 MERV 8 AC & Furnace Air Filters.  Actual Size: 15 3/8” x 19 1/2” x 3/4”.  Filtration Rating: MERV 8, MPR 600, FPR 5.  Protects: Lint, Dust, Pet Dander,...

18x20x2 MERV 11 HVAC Air Filters

As Low As $8.45 Per Filter!  18 x 20 x 2 MERV 11 AC and Furnace Air Filters.  Actual Dimensions: 17-1/2 x 19-1/2 x 1-3/4.  Filtration Rating: MERV 11, FPR 7, MPR 1000.  Protection: Smoke, Pet Dander, Pollen, Bacteria,...

18x20x2 MERV 13 HVAC Air Filters

As Low As $11.97 Per Filter!   18 x 20 x 2 Air Conditioner and Furnace Filter.  Actual Size: 17-1/2 x 19-1/2 x 1-3/4.  Filtration Rating: MERV 13, FPR 10, MPR 2200.  Protects: Pollen, dirt, dust, pet dander,...

18x20x2 MERV 8 HVAC Air Filters

As Low As $5.83 Per Filter! 18 x 20 x 2 MERV 8 HVAC Air Filters.   Actual Dimensions: 17 ½” x 19 ½” x 1 ¾”.  Filtration Rating: MERV 8, MPR 600, FPR 5.  Captures: Lint, dust,...

18x24x1 MERV 13 HVAC Air Filters

As Low as $7.99 per Filter!    18 x 24 x 1 MERV 13 Air Filter for A/C and Furnace.  Actual Dimensions: 17-3/8 x 23-3/8 x 3/4.  Filter Rating: MERV 13, FPR 10, MPR 2200.   Our premium 18x24x1 MERV 13...