36" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 38 5/8" X 20 5/8"] 8in diameter but still very thin

but still very thin

+ Product Details Size – 12" x 30" or 30" x 12" is the size for the duct opening measurement only

+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

+ Product Spec Sheet Floor Register Spec Sheet

this flex duct decreases the pressure loss and provides a more hygienic environment

36" X 18" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 38 5/8" X 20 5/8"] 8in diameter but still very thin+ Product Details Size 36"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 38 5 8" width X 20 5 8" height High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Ceiling Design Fixed hinged for easy filter change & cleaning uses a 1" thick filter. Our filter grille latch is easy to use on your fingers and