20" x 24" x 2" MERV 4 - Residential Washable Air Filter 19-875l 20" x 21" x 1"

20" x 21" x 1" MERV 6 - Fiberglass Air Filter - 6 Pack

to protect occupants from airborne irritants and should be changed every 60-90 days depending on levels of air contaminants

19 7/8" x 21 1/2" x 2" MERV 6 - Fiberglass Air Filter - 6 Pack

Actual Dimensions: 19 7/8" x 22 7/8" x 3/4"

15" x 20" x 2" MERV 4 - Residential Washable Air Filter - 1 Pack

20" x 24" x 2" MERV 4 - Residential Washable Air Filter 19-875l 20" x 21" x 1"20" x 24" x 2" MERV 4 Residential Washable Air Filter 1 Pack Actual Dimensions: 20" x 24" x 1 3 4 These quality filters are built to last a lifetime. They are interchangeable with 1" disposable filters and can be used again and again. The secret behind the filter's performance is its patented stage loading peak and valley design. Instead of face loading (particles captured on the outer surface of the filter) the filter uses stage loading, with each