Query: 17 x 21 x1 air filter
Aerostar 16 1/2 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 16 1/2"x21 1/2"x3/4")
SpiroPure 17.5X21X1 MERV 8 Geothermal Air Filters - Made in USA (6 Pack)
Filter King 17x21x1 Air Filters | 6 Pack | MERV 8 HVAC Pleated AC Furnace Filters, Protection Against Pollen, Allergen Reduction, Increases Air Quality | Actual Size
Filter King 17x21x1 Air Filters | 4 Pack | MERV 8 HVAC Pleated AC Furnace Filters, Protection Against Pollen, Allergen Reduction, Increases Air Quality
Filtrete 17.5x23.5x1, AC Furnace Air Filter, MPR 1000, Micro Allergen Defense, 6-Pack (exact dimensions 17.19 x 23.19 x 0.81)
Accumulair Gold 17x21x1 (Actual Size) MERV 8 Air Filter/Furnace Filter (2 Pack)
Glasfloss 16-3/8 x 21-1/2 x 1 Air Filters (Case of 4), MERV 10, Pleated, Made in USA - Fits Listed Models of Carrier, Bryant & Payne
Aerostar 16 1/2x21 1/2x1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6-Pack (Actual Size: 16 1/2" x 21 1/2" x 3/4")
Accumulair Gold 17.5X22x1 (Actual Size) MERV 8 Air Filter/Furnace Filters (4 Pack)
Filterbuy 17x22x1 Air Filter MERV 8, Pleated HVAC AC Furnace Filters (2-Pack, Silver)
Filterbuy 17x22x1 Air Filter MERV 8, Pleated HVAC AC Furnace Filters (6-Pack, Silver)
Accumulair Platinum 17x21x1 (Actual Size) MERV 11 Air Filter/Furnace Filters (6 pack)
Accumulair FC17X21A_4 MERV 6 Rating Air Filter/Furnace Filters, 17x21x1 (Actual Size) - 4 pack
Accumulair Diamond 17x21x1 (Actual Size) MERV 13 Air Filter/Furnace Filters (6 Pack) (FD17X21A_6)
Flanders PrecisionAire 84857.01175235 17.5 by 23.5 by 1 NaturalAire with Baking Soda, 4-Pack