26" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 22 5/8"] Color_R-4.2 Yellow R Value Rating of Insulation

R Value Rating of Insulation - R3

Whether you choose the modern contemporary

Actual Filter Size – 13 3/4"w x 17 3/4" x 1"

and waste gases transmission lines

26" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 28 5/8" X 22 5/8"] Color_R-4.2 Yellow R Value Rating of Insulation+ Product Details Size 26"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 28 5 8" width X 22 5 8" height Actual Filter Size 25 3 4"w x 19 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.