8" X 16" or 16" x 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 17.75] 3-Way or 4-Way + Product Details Size -

+ Product Details Size - 12"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Cut into any shape & size – With an original dimension of 15

+ Product Details Size – 18" x 22" or 22" x 18" is the size for the duct opening measurement only

+ Product Details Size & Compatibilty - The 8" to 4" round metal pipe reducer & increaser 30 gauge is compatible with duct 8" to 4"

8" X 16" or 16" x 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 17.75] 3-Way or 4-Way + Product Details Size -+ Product Details Size 8"w X 16"h or 16" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 17. 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