10"w X 10"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 11.75"H] Compatible With Duct 6in with actual outer dimensions of

with actual outer dimensions of 20

Adjustable airflow control - by rotating the middle disk

Actual Filter Size – 25 3/4"w x 27 3/4" x 1"

Actual Filter Size – 11 3/4"w x 21 3/4" x 1"

allowing unrestricted airflow for optimal HVAC performance

10"w X 10"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 11.75"H] Compatible With Duct 6in with actual outer dimensions of+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 11. 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