18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] Welding & Soldering This 20" X 6" end

This 20" X 6" end cap is constructed with 26-gauge galvanized steel

simply pop the diffuser into the wall duct hole and let the side springs hold it securely in place

with actual outer dimensions of 36

Filter Size - 29

Ideal for Walls & Ceilings: Designed for seamless installation in standard 8" X 6" duct openings

18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] Welding & Soldering This 20" X 6" end+ 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