12"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] Fixed Blades with Damper + Product Details Size -

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 38 5/8" height

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

+ Product Spec Sheet Round Ceiling Diffuser Spec Sheet

12"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] Fixed Blades with Damper + Product Details Size -+ Product Details Size 12"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 7. 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