18" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 22 5/8"] Supply Grille angle the louvers up for

angle the louvers up for efficient cooling

+ Product Details Size – 24"w X 16"h is the size for the duct opening measurement only

Location – Sidewall and ceiling

ensuring it arrives in perfect condition

18" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 22 5/8"] Supply Grille angle the louvers up for+ Product Details Size 18"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 22 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