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

+ Product Details Size - 12"w X 26"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 34"h is the size for the duct opening measurement only

R value rating of insulation - R3

875" width X 12" height

+ Product Details Size – 24"w X 16"h is the size for the duct opening measurement only

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