18 Inch Height

Zephyr 18x18x3 VGF Merv 11 Media Air Cleaner Replacement Filter for Return Air Grilles. Case of 3

The 18x18x3 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,...