16" X 6" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 7.75"H] w16h16 + Product Details Size –

+ Product Details Size – 30"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 4"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 11 3/4" x 1"

+ Product Details Size - 28"w X 30"h is the size for the duct opening measurement only

16" X 6" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 7.75"H] w16h16 + Product Details Size –+ Product Details Size 16"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 7. 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