16" X 16" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 18 5/8" X 18 5/8"] Color_Black the gap will expand and

the gap will expand and retract to meet perfect air supply needed

+ Product Details Size - 8"w X 26"h is the size for the duct opening measurement only

75" width X 25

Measure the size of the air duct/drywall opening

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