16" X 20" or 20" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 21.75] RG66 Black-HP + Product Details Size -

+ Product Details Size - 6"w X 22"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening)

Our Galvanized Duct Box is made of high-quality 26-Gauge galvanized sheet metal for durability

+ Product Details Size – 24"w X 30"h or 30" X 24" is the size for the duct opening measurement only

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

16" X 20" or 20" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 21.75] RG66 Black-HP + Product Details Size -+ Product Details Size 16"w X 20"h or 20" X 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 21. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation. Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully