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

+ Product Details Size – Stick-on collar is 10" and it is compatible with duct 10"

+ Why HVAC Premium

+ Product Details Size - 10"w X 28"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 34 5/8" width X 36 5/8" height

20" X 12" Or 12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Color_Brown + Product Details Size –+ Product Details Size 20"w X 12"h or 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