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

+ Product Details Size & Compatibility – The size of sheet metal pipe is 4" round x 120" long

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 28" OR 28" X 16" duct opening (measured at the opening)

Our Galvanized Sheet Metal Duct Pipes are manufactured from high quality galvanized steel

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

14" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

16" X 20" or 20" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 21.75] Brown + 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