fog Giant Alienation 21.5 x21 5x1 air filter Persistence air option
19.75x21.5x1 AIRx DUST Air Filter, 6-Pack
AIRx Filters 21.5x23.5x1 Air Filter MERV 8 Pleated HVAC AC Furnace Air Filter, Dust 6-Pack, Made in the USA - Amazon.com
AIRx Filters 21.5x23.5x1 Air Filter MERV 11 Pleated HVAC AC Furnace Air Filter, Allergy 6-Pack, Made in the USA - Amazon.com
SpiroPure 21.5X21.5X1 MERV 8 Pleated Air Filters - Made in USA (6 Pack) - Amazon.com
SpiroPure 21.5X21.5X1 MERV 8 Pleated Air Filters - Made in USA (6 Pack) - Amazon.com
19.75x21.5x1 Air Filters for AC & Furnace | Filter King
21.5x21.5x1 Odor Eliminator Air Filters - $21.54/ea.
Filtrete 16.5-in W x 21.5-in L x 1-in MERV 11 1085 MPR Allergen Defense Extra Electrostatic Pleated Air Filter (2-Pack) in the Air Filters department at Lowes.com
Pamlico 19-7/8 x 21-1/2 x 1 MERV 11 ( FPR 8-9 ) Pleated Air Filters. Case of 12 | eBay
SpiroPure 21.5X21.5X1 MERV 8 Pleated Air Filters - Made in USA (6 Pack) - Amazon.com
Filter King Air Filters 21.5x24x1 4-PACK MERV 8 HVAC Pleated AC Furnace Filters Air Purifier Replacement Filters for Clean, Healthy & Fresh Environment MADE IN USA 21.5x24x1 Inch (Pack of 4) - Walmart.com
19 1/2x21 1/2x1 - Air Filter – Air Filters Delivered
16 3/4x21 1/2x1 - Air Filter – Air Filters Delivered