16" X 16" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 18 5/8"] return grille + Product Details Size -

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

See chart below:

The operable dampers

+ Product Details Size – 24"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 12 5/8" height -

16" X 16" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 18 5/8"] return grille + Product Details Size -+ 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. High Quality high quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Ceiling Design Fixed hinged for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your fingers and