20" X 30" or 30" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 31.75] w28h28 + Product Details Size -

+ Product Details Size - 32"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 16"h X 2"d (for duct opening measurement only)

5mm and 5x2

+ Product Details Size & Compatibilty - The 16" to 12" round metal pipe reducer & increaser 30 gauge is compatible with duct 16" to 12"

Applications – Suitable for cutting plastic

20" X 30" or 30" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 31.75] w28h28 + 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