20" X 26" Or 26" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 27.75] 7" Round Duct Pipe + Product Details Size –

+ Product Details Size – Duct end cap is 14" X 8" | 26-gauge galvanized steel end cap

Adjustable airflow control – Adjustable airflow control: The system allows users to customize the amount of air supply

actual front end outer dimensions are 21" Width X 21" Height

+ Product Details Size - 36"w X 4"h is the size for the duct opening measurement only

20" X 26" Or 26" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 27.75] 7" Round Duct Pipe + Product Details Size –+ Product Details Size 20"w X 26"h or 26" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" width X 27. 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