16" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 18 5/8" X 27 5/8"] Copper Coil-Insulated Line Set while the ingenious dial-controlled damper

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

+ Product Details Size - 28"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 38 5/8" height

+ Product Details Size – 22"w X 22"h is the size for the duct opening measurement only

16" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 18 5/8" X 27 5/8"] Copper Coil-Insulated Line Set while the ingenious dial-controlled damper+ 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.