12" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 13.75] 8 Feet Long + Product Details Size –

+ Product Details Size – 16"w X 36"h is the size for the duct opening measurement only

designed for systems up to 500lbs

+ Product Details Size – 10" X 4" is the opening (vent hole) dimension - actual size is approx

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

This 22" X 10" end cap is constructed with 26-gauge galvanized steel

12" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 13.75] 8 Feet Long + Product Details Size –+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 13. 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 shrink