14" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 27 5/8"] w12h12 + Product Details Size -

+ Product Details Size - 6"w X 30"h is the size for the duct opening measurement only

And is classified as Class 1 Fire Proof - B1

Actual Filter Size – 11 3/4"w x 19 3/4" x 1"

+ Product Description Enhance your HVAC system with our Aluminum Return Filter Linear Bar Grille

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

14" X 25" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 16 5/8" X 27 5/8"] w12h12 + Product Details Size -+ Product Details Size 14"w X 25"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16 5 8" width X 27 5 8" height Actual Filter Size 13 3 4"w x 24 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.