12"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] Compatible With Duct 8in + Product Details Size –

+ Product Details Size – 22"w X 18"h is the size for the duct opening measurement only

this grille offers durability and resistance to rust and corrosion

Actual Filter Size – 27 3/4"w x 7 3/4" x 1"

+ Product Description Upgrade your HVAC system with our 6" Round Air Vent Supply Grille

12"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] Compatible With Duct 8in + Product Details Size –+ Product Details Size 12"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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