8" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] 18" Diameter + Product Details Size –

+ Product Details Size – 25"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 22" or 22" x 10" is the size for the duct opening measurement only

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

+ Product Details Size – 22" x 22" is the size for the duct opening measurement only

8" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] 18" Diameter + Product Details Size –+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 5. 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