14" X 20" Or 20" X 14" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 15.75 X 21.75] Sheet Metal Fittings + Product Details Size –

+ Product Details Size – 12" X 2" is the size for the duct opening (floor/vent hole) measurement only

But for plumbing it will fit onto a pipe that is 1/4" on the "inside" (ID) which equals to 1/2 on the outside

Location – sidewall and ceiling

+ Product Details Size - 30"w X 25"h is the size for the duct opening measurement only

with actual outer dimensions of 12

14" X 20" Or 20" X 14" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 15.75 X 21.75] Sheet Metal Fittings + Product Details Size –+ Product Details Size 14"w X 20"h or 20" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 21. 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