8" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 10 5/8" X 30 5/8"] Insulated Line 4" X 12" Is The

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size - 24"w X 36"h is the size for the duct opening measurement only

+ Product Spec Sheet Return Air Grille Spec Sheet

actual front end outer dimensions are approximately 18 5/8" width X 38 5/8" height

+ Product Details Size - 8"w X 8"h is the size for the duct opening measurement only

8" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 10 5/8" X 30 5/8"] Insulated Line 4" X 12" Is The+ Product Details Size 8"w X 28"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 10 5 8" width X 30 5 8" height Actual Filter Size 7 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 Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our