Carrier 21.5×23.5×1 Compatible AC/Furnace Air Filter (Made by American Filter Company™) Made in U.S.A – American Filter Company
21.5x23.5x1 MERV 8 AC & Furnace Filters - $16.97/ea.
AIRx Filters 21.5x23.5x1 Air Filter MERV 8 Pleated HVAC AC Furnace Air Filter, Dust 6-Pack, Made in the USA - Amazon.com
SpiroPure 21.5x23.5x1 MERV 13 Pleated Filter Air Filters - Made in USA (6 Pack) - Amazon.com
Air-Care AC21523501 Electrostatic Furnace Air Filter for sale online | eBay
Filtrete 21.5-in W x 23.5-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
Filterbuy 21x23.5x1 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 21.00 x 23.50 x 1.00 Inches) - 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
AIRX FILTERS WICKED CLEAN AIR. 21.5x23.5x1 Air Filter MERV 8 Electrostatic Pleated Air Conditioner Filter 6 Pack HVAC AC Furnace Filters - Amazon.com
AIRX FILTERS WICKED CLEAN AIR. 21.5x23.5x1 Air Filter MERV 11 Electrostatic Pleated Air Conditioner Filter 4 Pack HVAC AC Furnace Filters - Amazon.com