12" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] 18in diameter + Product Details Operating Temperature

+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

Its linear bar design maximizes ventilation

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

Universal Fit – Measures 6" wide x 3-1-13/16" high x 3-1/8" deep

12" X 4" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 5.75"H] 18in diameter + Product Details Operating Temperature+ Product Details Size 12"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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