8" X 18" Or 18" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 19.75] 4in diameter Filter Size - 21

Filter Size - 21

Built to last

} + Product Details Size & Compatibility - The size of a boot register end is 14" X 4" X 7" galvanized floor boot end center 26-gauge

+ Product Details Size – Duct end cap is 20" X 10" | 26-gauge galvanized steel end cap

8" X 18" Or 18" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 19.75] 4in diameter Filter Size - 21+ Product Details Size 8"w X 18"h or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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