18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] 8" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 21

The premium durable material guarantees that they will never rust or wear through

rectangular shape

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 6" OR 6" x 28" duct opening (measured at the opening)

Copper coil line set fits most ductless mini split air conditioners

18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] 8" Round Duct Pipe actual front end outer dimensions+ Product Details Size 18"w X 36"h or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 37. 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