12"w X 12"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] Compatible with Duct 6" our damper is designed to

our damper is designed to perfectly align with your setup

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

+ Product Details Size – 30"w X 16"h is the size for the duct opening measurement only

High Quality – High grade steel construction with easy unrestricted air flow for your HVAC system

actual front end outer dimensions are approximately 18 5/8" width X 32 5/8" height -

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