14" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 20 5/8"] flat stamped steel } (function () { const

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+ Product Details Size - 28"w X 18"h is the size for the duct opening measurement only

Every grille has a front end frame that will overlap at the wall joint

The operable dampers

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

14" X 18" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 20 5/8"] flat stamped steel } (function () { const+ Product Details Size 14"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 20 5 8" height Actual Filter Size 13 3 4"w x 17 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.