12" X 12" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] Material_Aluminum from 4" to 20"

from 4" to 20"

and then smoothly drop in the grill

+ Product Details Size – 12"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 12 5/8" height

12" X 12" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] Material_Aluminum from 4" to 20"+ 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