12"w X 12"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] w20h20 + Product Details Size –

+ Product Details Size – 36"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 38 5/8" height -

+ Product Details Size - 20"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are 17" Width X 17" Height

12"w X 12"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] w20h20 + Product Details Size –+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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