12"w X 8"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 9.75"H] w34h34 + Product Details Size -

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 32"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 28"h is the size for the duct opening measurement only

75" Width X 17

+ Product Description Introducing the 8" Radial Damper – Your Solution for Controlled Airflow

12"w X 8"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 9.75"H] w34h34 + Product Details Size -+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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