12" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] Supply Grille + Product Details Size –

+ Product Details Size – 36"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 32"w X 18"h is the size for the duct opening measurement only

designed for superior airflow control and noise-free operation

+ Product Details Size - 22"w X 6"h is the size for the duct opening measurement only

12" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] Supply Grille + Product Details Size –+ Product Details Size 12"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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