10" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Ceiling + Product Details Size –

+ Product Details Size – 28"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 6"h is the size for the duct opening measurement only

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

+ Product Details Size – 24"w X 24"h

10" X 4" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Ceiling + Product Details Size –+ Product Details Size 10"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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