21 1/2" x 23 1/2" x 1" MERV 4 - Residential Washable Air Filter Residential Washable Air Filter:21 1/2" x 23 1/2" x 1" MERV 4 - Residential Washable Air Filter 21 1/2" x 23 5/16"

21 1/2" x 23 5/16" x 1" MERV 4 - Residential Washable Air Filter - 1 Pack

Actual Dimensions: 19 1/2" x 19 1/2" x 3 3/4"

14" x 25" x 1" MERV 6 - Fiberglass Air Filter - 6 Pack

and it can be used either dry or coated with filter adhesive

Factory made to fit with no hassles or problems cutting and sizing adjustable filters

21 1/2" x 23 1/2" x 1" MERV 4 - Residential Washable Air Filter Residential Washable Air Filter:21 1/2" x 23 1/2" x 1" MERV 4 - Residential Washable Air Filter 21 1/2" x 23 5/16"21 1 2" x 23 1 2" x 1" MERV 4 Residential Washable Air Filter 1 Pack Actual Dimensions: 21. 5" x 23. 5" x 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,