6" X 18" or 18" x 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 19.75] 4" Diameter Dimensions With Outer End are

Dimensions With Outer End are 13

but not square ones

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 22" OR 22" x 24" duct opening (measured at the opening)

width: 100%

3/4” - 2981 PSI

6" X 18" or 18" x 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 19.75] 4" Diameter Dimensions With Outer End are+ Product Details Size 6"w X 18"h or 18" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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