20" X 6" [Duct Opening] 2-Way Vertical Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 21.75"W X 7.75"H] Compatible With Duct 10in + Product Details Size –

+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

Actual Filter Size – 7 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are 6" diameter

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

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 6" duct openings

20" X 6" [Duct Opening] 2-Way Vertical Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 21.75"W X 7.75"H] Compatible With Duct 10in + Product Details Size –+ Product Details Size 20"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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