16" X 20" or 20" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 21.75] Wall Angle Floor Boot + Product Details Size –

+ Product Details Size – 14"w X 12"h is the size for the duct opening measurement only

L/H@0 FT: - 38

These Supply Diffusers with integral round necks are recommended for heating

+Product Details Size – 4"h x 12"w is the size for the duct opening measurement only

16" X 20" or 20" X 16" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 17.75 X 21.75] Wall Angle Floor Boot + Product Details Size –+ Product Details Size 16"w X 20"h or 20" X 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 21. 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