36" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 12 5/8"] Color_Black The first number in a

The first number in a grille size

+ Product Details Size – 15" Wooden Corner Baseboard Grille

Slots are angled to diversify the airflow in 2 way direction

+ Product Details Size – 18"w X 20"h is the size for the duct opening measurement only

Crafted from solid stamped steel

36" X 10" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 38 5/8" X 12 5/8"] Color_Black The first number in a+ 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