12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Line Covers + Product Details Size -

+ Product Details Size - 20"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are 19

+ Product Details Size - 14"w X 22"h X 2"d (for duct opening measurement only)

compatible with duct 5"

12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Line Covers + Product Details Size -+ Product Details Size 12" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 13. 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 shrink wrapped