20" X 30" or 30" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 31.75] 5" Diameter and lay it flat in

and lay it flat in the grid

made of 1/2" UV-resistant Polypropylene

+ Product Details Size – 4"w X 12"h is the size for the duct opening measurement only

Applications – The galvanized steel metal round duct is used to cut into a plenum or rectangular duct to begin a trunk line or branch-like runs

+ Product Details Size - 28"w X 12"h X 2"d (for duct opening measurement only)

20" X 30" or 30" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 31.75] 5" Diameter and lay it flat in+ Product Details Size 12"w X 30"h or 30" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 31. 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