8" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 10 5/8" X 14 5/8"] 18in diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 18" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 20" duct opening (measured at the opening)

+ Product Details Size - 14"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 13 3/4" x 1"

+ Product Details Size - 4"w X 26"h is the size for the duct opening measurement only

8" X 12" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 10 5/8" X 14 5/8"] 18in diameter + Product Details Perfect Fit+ Product Details Size 8"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 10 5 8" width X 14 5 8" height Actual Filter Size 7 3 4"w x 11 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our