16" X 16" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 18 5/8"] Aluminum - Cube Core But they are also the

But they are also the most visible representation of you air system

then you'll need a 14-inch round vent

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

+Product Details Size – 2"h x 12"w is the size for the duct opening measurement only

16" X 16" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 18 5/8"] Aluminum - Cube Core But they are also the+ 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