28" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 38 5/8"] return grille + Product Details Size -

+ Product Details Size - 16"w X 22"h is the size for the duct opening measurement only

Foot Operated Opposed Blade Damper For Full Air Flow Control And Shutoff

but you will appreciate the benefits over the period of time

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height -

actual front end outer dimensions are approximately 36 5/8" width X 22 5/8" height

28" X 36" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 30 5/8" X 38 5/8"] return grille + Product Details Size -+ Product Details Size 28"w X 36"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 30 5 8" width X 38 5 8" height Actual Filter Size 27 3 4"w x 35 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.