22" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 24 5/8" X 20 5/8"] Copper Coil-Insulated Line Set It has an outer surface

It has an outer surface made of high-quality aluminum foil and an inner surface made of metalized PET with inside high-tensile spring steel wire

Actual Filter Size – 11 3/4"w x 23 3/4" x 1"

Actual Filter Size – 7 3/4"w x 29 3/4" x 1"

But they are also the most visible representation of you air system

+ Product Details Size - 6"w X 28"h is the size for the duct opening measurement only

22" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 24 5/8" X 20 5/8"] Copper Coil-Insulated Line Set It has an outer surface+ Product Details Size 22"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 24 5 8" width X 20 5 8" height Actual Filter Size 21 3 4"w x 17 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on