36" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 12 5/8"] 18" Round Duct Pipe 875" width X 13

875" width X 13

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

Perfect for sidewall or ceiling installation

Actual Filter Size – 29 3/4"w x 9 3/4" x 1"

36" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 12 5/8"] 18" Round Duct Pipe 875" width X 13+ Product Details Size 36"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 38 5 8" width X 12 5 8" height 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 filter grille latch is easy to use on