24" X 12" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 25.75"W X 13.75"H] Outdoor Vent Covers + Product Details Size -

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

Design – Individually adjusting curved blades for better air flow control

+ Product Details Size - 30"w X 12"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 26

actual front end outer dimensions are approximately 26 5/8" width X 34 5/8" height

24" X 12" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 25.75"W X 13.75"H] Outdoor Vent Covers + Product Details Size -+ Product Details Size 24"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 75" width X 13. 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