26" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 30 5/8"] White which the interior PET provides

which the interior PET provides

Actual Filter Size – 9 3/4"w x 17 3/4" x 1"

+ Product Details Size - 20"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 24"h is the size for the duct opening measurement only

26" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 30 5/8"] White which the interior PET provides+ Product Details Size 26"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 28 5 8" width X 30 5 8" height Actual Filter Size 25 3 4"w x 27 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