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to protect occupants from airborne irritants and should be changed every 60-90 days depending on levels of air contaminants
12" x 18" x 1" MERV 4 - Residential Washable Air Filter - 1 Pack
MERV 11 pleated filters are an ideal upgrade from standard disposable panel filters
12" x 20" x 2" Permanent Washable Air Filter - 1 Pack
Actual Dimensions: 19 7/8" x 22 7/8" x 3/4"
22" x 36" x 1" MERV 4 - Residential Washable Air Filter 12l to protect occupants from airborne22" x 36" x 1" MERV 4 Residential Washable Air Filter 1 Pack Actual Dimensions: 22" x 36" 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, with each
