16" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 18 5/8" X 27 5/8"] Floor Grille the actual front end outer

the actual front end outer dimensions are 7" in diameter

actual front end outer dimensions are approximately 26 5/8" width X 22 5/8" height

+ Product Details Size - 26"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 20"h is the size for the duct opening measurement only

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16" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 18 5/8" X 27 5/8"] Floor Grille the actual front end outer+ Product Details Size 16"w X 25"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 18 5 8" width X 27 5 8" height Actual Filter Size 15 3 4"w x 24 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.