14" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 16 5/8" X 12 5/8"] flat stamped steel + Product Details Size -

+ Product Details Size - 28"w X 12"h is the size for the duct opening measurement only

Looks like it was just waxed

Actual Filter Size – 21 3/4"w x 25 3/4" x 1"

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+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

14" X 10" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 16 5/8" X 12 5/8"] flat stamped steel + Product Details Size -+ Product Details Size 14"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 12 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