20" x 20" x 12" 85% No Header Rigid Filter Commercial Rigid Box Filter Galvanized Rigid Box Filter:20" x 20" x 12 85% No Header Rigid Filter 14" x 36" x 1"

14" x 36" x 1" Permanent Washable Air Filter - 1 Pack

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

Actual Dimensions: 21 7/8" x 27 7/8" x 1 3/4"

Actual Dimensions: 19 7/8" x 20 7/8" x 1 3/4"

20" x 20" x 12" 85% No Header Rigid Filter Commercial Rigid Box Filter Galvanized Rigid Box Filter:20" x 20" x 12 85% No Header Rigid Filter 14" x 36" x 1"20" x 20" x 12" 85% No Header Rigid Filter 1 Pack 20" x 20" x 12" 85% No Header Rigid Filter The Filtration Group Rigid Air Filter is a steel cased air filter engineered to provide medium and high efficiency filtration combined with a prolonged life cycle. Its box filter construction eliminates the need for retainer and special external wire media supports. The perimeter frame is constructed of high strength, corrosion resistant galvanized steel.