12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Oval to Round 90-Degree Boot These tabs dig into the

These tabs dig into the main duct when you push the fitting in

+ Product Details Size – 24"w X 30"h is the size for the duct opening measurement only

75" Width X 35

+ Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only

12" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 13.75] Oval to Round 90-Degree Boot These tabs dig into the+ Product Details Size 12" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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 wrapped