16" X 24" or 24" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 25.75] 12" Round Duct Pipe + Product Details Size -

+ Product Details Size - 12"w X 28"h is the size for the duct opening measurement only

+ Product Description Crafted with precision

actual front end outer dimensions are approximately 18 5/8" width X 38 5/8" height

+ Product Details Size & Compatibilty - The 12" to 6" round metal pipe reducer & increaser 30 gauge is compatible with duct 12" to 6"

16" X 24" or 24" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 25.75] 12" Round Duct Pipe + Product Details Size -+ Product Details Size 16"w X 24"h or 24" X 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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