26" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 28 5/8"] w12h12 + Product Details Size -

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

and the second number represents the height

actual front end outer dimensions are approximately 33

actual front end outer dimensions are 13

26" X 26" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 28 5/8"] w12h12 + Product Details Size -+ Product Details Size 26"w X 26"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 Actual Filter Size 25 3 4"w x 25 3 4" x 1" High quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on