10" X 24" or 24" X 10" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 11.75 X 25.75] Access Door + Product Details Size –

+ Product Details Size – Sheet metal duct board take off start collar is 18" and it is compatible with duct 18"

+ Product Details Size – The size of 10" straight saddle stick on take-off is 10" and it is compatible with duct 10"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 4" duct openings

+ Product Details Size - 14"w X 10"h X 2"d (for duct opening measurement only)

with actual front end outer dimensions of 5"

10" X 24" or 24" X 10" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 11.75 X 25.75] Access Door + Product Details Size –+ Product Details Size 10"w X 24"h or 24" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 25. 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