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

+ Product Details Size - 16"w X 8"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 17 3/4" x 1"

The grille comes with all necessary screws for a secure fit

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

16" X 16" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 18 5/8"] ceiling + 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