8" X 4" [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 5.75"H] Compatible with Duct 10" + Product Details Size -

+ Product Details Size - 6"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 8 5/8" height

Designed with a ring base for flexible installation

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

Actual Filter Size – 29 3/4"w x 27 3/4" x 1"

8" X 4" [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 5.75"H] Compatible with Duct 10" + 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