![Filterbuy 13x21.5x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 12.88 x 21.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com Filterbuy 13x21.5x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 12.88 x 21.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/81+Dvhk-SEL.jpg)
Filterbuy 13x21.5x1 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 12.88 x 21.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com
![AIRx Filters 13x21.5x1 Air Filter MERV 8 Pleated HVAC AC Furnace Air Filter, Dust 6-Pack, Made in the USA - Amazon.com AIRx Filters 13x21.5x1 Air Filter MERV 8 Pleated HVAC AC Furnace Air Filter, Dust 6-Pack, Made in the USA - Amazon.com](https://m.media-amazon.com/images/I/514JkDKW2BL._AC_UF894,1000_QL80_.jpg)
AIRx Filters 13x21.5x1 Air Filter MERV 8 Pleated HVAC AC Furnace Air Filter, Dust 6-Pack, Made in the USA - Amazon.com
![Filter King 13x21.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated AC Furnace Filters | Actual Size 13 x 21.5 x .75" - Amazon.com Filter King 13x21.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated AC Furnace Filters | Actual Size 13 x 21.5 x .75" - Amazon.com](https://m.media-amazon.com/images/I/71URfE6UejL._AC_UF894,1000_QL80_.jpg)
Filter King 13x21.5x1 Air Filter | 4-PACK | MERV 8 HVAC Pleated AC Furnace Filters | Actual Size 13 x 21.5 x .75" - Amazon.com
![Filterbuy 13x21.5x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 12.88 x 21.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com Filterbuy 13x21.5x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 12.88 x 21.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/51kPWqusCkL._AC_.jpg)
Filterbuy 13x21.5x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 12.88 x 21.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com
![Amazon.com: 13x21.5x1 Air Filter MERV 11 Rating, 12 Pack of Furnace Filters Comparable to MPR 1000, MPR 1200 & FPR 7 - Made in USA by AIRX FILTERS WICKED CLEAN AIR. : Home & Kitchen Amazon.com: 13x21.5x1 Air Filter MERV 11 Rating, 12 Pack of Furnace Filters Comparable to MPR 1000, MPR 1200 & FPR 7 - Made in USA by AIRX FILTERS WICKED CLEAN AIR. : Home & Kitchen](https://m.media-amazon.com/images/I/71VlbcUYW3L._AC_UF894,1000_QL80_.jpg)