20" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included *[Outer Dimensions: 22 5/8" X 32 5/8"] Insulated Line Set actual front end outer dimensions

actual front end outer dimensions are approximately 27 5/8" width X 24 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 25" OR 25" X 16" duct opening (measured at the opening)

+ Product Details Size - 14"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 14 5/8" height

+ Product Details Size - 36"w X 36"h is the size for the duct opening measurement only

20" X 30" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included *[Outer Dimensions: 22 5/8" X 32 5/8"] Insulated Line Set actual front end outer dimensions+ Product Details Size 20"w X 30"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 22 5 8" width X 32 5 8" height Actual Filter Size 19 3 4"w x 29 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.