12"w X 8"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 9.75"H] Fixed Blades + Product Details Size –

+ Product Details Size – 18"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 32 5/8" height

+ Product Details Size - 36"w X 8"h is the size for the duct opening measurement only

Installation – Easy to Install

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12"w X 8"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 9.75"H] Fixed Blades + Product Details Size –+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 9. 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