6" X 20" Or 20" X 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 21.75] w12h12 + Product Details Size -

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

this heavy-duty work belt is constructed with durable 1680D Polyester and boasts reinforced pouch bottoms

you can attain the diameter of the vent

Actual Filter Size – 33 3/4"w x 33 3/4" x 1"

With a 5-inch size

6" X 20" Or 20" X 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 21.75] w12h12 + Product Details 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