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 + Product Details Size –

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

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

designed to transition ducts from larger to smaller sizes

made of 1/2" UV-resistant Polypropylene

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 + Product Details Size –+ 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