8" X 20" Or 20" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 21.75] mobile home rv The ring base allows installation

The ring base allows installation without removing the thermostat

actual front end outer dimensions are 13" Width X 13" Height

larger than the same nominal size "plumbing" pipe

+ Product Details Size – 10" round duct opening-

+ Product Details Size - 32"w X 18"h X 2"d (for duct opening measurement only)

8" X 20" Or 20" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 21.75] mobile home rv The ring base allows installation+ Product Details Size 8"w X 20"h or 20" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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