10"w X 8"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 9.75"H] Fixed Blades with Damper + Product Details Size -

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

3/8" - 4223 PSI

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+ Product Details Size - 8"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

10"w X 8"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 9.75"H] Fixed Blades with Damper + Product Details Size -+ Product Details Size 10"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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