12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] Round Duct Pipe Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 31 3/4" x 1"

For 6" duct opening

+ Product Details Size – 8"w X 20"h or 20" x 8" is the size for the duct opening measurement only

75"H – fits a 18" X 10" duct opening

12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] Round Duct Pipe Actual Filter Size – 7+ Product Details Size 12"w X 18"h or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 19. 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