18 Inch Width

Glasfloss ZL 14x18x1 MERV 10 (FPR 5-6) AC Furnace Air Filters. (Box of 6). Actual Size: 13-1/2 x 17-1/2 x 7/8

Actual Size: 13-1/2 x 17-1/2 x 7/8 | Nominal Size: 14 x 18 x 1 ? Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR 5-6 rating. Improved MERV 10 Filtration with similar air flow and resistance as a MERV 8 filter. Durable & Long...

Zephyr 18x24x3 VGF Merv 11 Media Air Cleaner Replacement Filter for Return Air Grilles. Case of 3

The 18x24x3 Merv 11 VGF Series 3 inch Deep 6-month Pleated Filters are a filter upgrade for your Return Air Filter Grilles that traditionally use 1 inch 3-month filter. Turns almost any air filter return into a media air cleaner. Gasketed Filter...

Zephyr 18x20x3 VGF Merv 11 Media Air Cleaner Replacement Filter for Return Air Grilles. Case of 3

The 18x20x3 Merv 11 VGF Series 3 inch Deep 6-month Pleated Filters are a filter upgrade for your Return Air Filter Grilles that traditionally use 1 inch 3-month filter. Turns almost any air filter return into a media air cleaner. Gasketed Filter...

18x20x2 MERV 13 HVAC Air Filters

As Low As $13.41 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,...