12" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 12 5/8"] w20h20 Insulation – A thick blanket

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

Actual Filter Size – 13 3/4"w x 24 3/4" x 1"

+ Product Details Size - 28"w X 8"h is the size for the duct opening measurement only

ventilation

12" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 14 5/8" X 12 5/8"] w20h20 Insulation – A thick blanket+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 12 5 8" height Actual Filter Size 11 3 4"w x 9 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter