12"w X 6"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] 6" Diameter please note that the total

please note that the total outer dimensions of the grille measure 10" in diameter

+ Product Details Size - 40"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are 22" width X 6" height

Operating from -40°F to +248°F

Whether replacing an old register or installing a new vent

12"w X 6"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 7.75"H] 6" Diameter please note that the total+ 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