8" X 8" [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 9.75"H] 6" Diameter Exceptional Craftsmanship: Hand-inspected for quality

Exceptional Craftsmanship: Hand-inspected for quality

including the ability to mount without removing the thermostat when using the ring base

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

and versatile for any project

actual front end outer dimensions are approximately 18 5/8" width X 20 5/8" height

8" X 8" [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 9.75"H] 6" Diameter Exceptional Craftsmanship: Hand-inspected for quality+ Product Details Size 8"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 9. 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