6" X 20" Or 20" X 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 21.75] w12h12 With a 5-inch size

With a 5-inch size

+ Why Hvac Premium Our MERV 8 pleated filter is 30 times more efficient at capturing small particles than ordinary fiberglass filters

+ Product Details Size – The size of 8" straight saddle stick on take-off is 12"/14" and it is compatible with duct 8"

+ Product Details Size - 16"w X 24"h is the size for the duct opening measurement only

you can attain the diameter of the vent

6" X 20" Or 20" X 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 21.75] w12h12 With a 5-inch size+ Product Details Size 6"w X 20"h or 20" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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