20" X 12" Or 12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] w16h16 Actual Filter Size – 9

Actual Filter Size – 9 3/4"w x 9 3/4" x 1"

High Quality & Durable – Made of UV and fire resistant ABS plastic – UL-94V-0 equivalent

+ Product Details Size - 10"w X 6"h X 2"d (for duct opening measurement only)

+ Product Details Size - 10"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Size & Compatibility – The size of the wall angle register boot is 8" X 6" X 4" and it is compatible with duct 4"

20" X 12" Or 12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] w16h16 Actual Filter Size – 9+ Product Details Size 20"w X 12"h or 12" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 13. 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