12" X 4" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] w30h30 + Product Details Size –

+ Product Details Size – 10"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 7

actual front end outer dimensions are approximately 36 5/8" width X 20 5/8" height

Both lines taped together every 18in for easier handling & installation

actual front end outer dimensions are approximately 28 5/8" width X 12 5/8" height

12" X 4" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] w30h30 + 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