8" X 8" [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 9.75"H] Supply Grille Think of the diameter as

Think of the diameter as a straight line from one end to the other

Powder-Coat Finish - Smooth

+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

+ Product Details Size – 36"w X 26"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26

8" X 8" [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 9.75"H] Supply Grille Think of the diameter as+ Product Details Size 8"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 9. 75" height. High Quality High quality steel with counter sunk screw holes (screws included) and no sharp edges. Equipped with a lever for easy airflow adjustment and dampening. Airflow Control Adjustable airflow lever allows precise control over the direction and volume of air. Installation Location