8" X 16" or 16" x 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 17.75] Height_22in + Product Details Perfect Fit LO246 Product Details Size 32 Compatible with Duct 4"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 18" OR 18" x 36" duct opening (measured at the opening)

+ Product Details Size - 16"w X 20"h is the size for the duct opening measurement only

Upgrade your system with our high-quality galvanized steel round duct

actual front end outer dimensions are approximately 10 5/8" width X 22 5/8" height

8" X 16" or 16" x 8" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 9.75 X 17.75] Height_22in + Product Details Perfect Fit LO246 Product Details Size 32 Compatible with Duct 4" + Product Details Perfect Fit & Easy Sizing Designed for a 36" x 18" OR 18" x 36" duct opening (measured at the opening) + Product Details Size 16"w X 20"h is the size for the duct opening measurement only