8" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] 18" Round Duct Pipe + Product Details Size –

+ Product Details Size – 28"w X 6"h is the size for the duct opening measurement only

Carefully packaged to prevent damage during shipment

The integral design allows you to easily adjust the curved blades

+ Product Details Size - 16"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 22 5/8" height

8" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"W X 5.75"H] 18" Round Duct Pipe + Product Details Size –+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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 Location