34" X 14" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 16 5/8"] w12h12 By simply measuring the width

By simply measuring the width or the length of the vent

+ Product Details Size – 16"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 28 5/8" height

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34" X 14" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 36 5/8" X 16 5/8"] w12h12 By simply measuring the width+ Product Details Size 34"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 36 5 8" width X 16 5 8" height Actual Filter Size 33 3 4"w x 13 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.