18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] 18in diameter + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 24"w X 14"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of the side round ceiling box is 10" X 10" X 8" and it is compatible with duct 8"

providing maximum flexibility

Whether it's a 45° or 95° degree angle

Designed with two mounting base options—solid and ring—it offers flexible installation

18" X 36" Or 36" X 18" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 19.75 X 37.75] 18in diameter + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 24"w X 14"h is the size for the duct opening measurement only + Product Details Size & Compatibility – The size of the side round ceiling box is 10" X 10" X 8" and it is compatible with duct 8"