14" X 14" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 15.75"H] 8" Round Duct Pipe + Product Details Size -

+ Product Details Size - 28"w X 16"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

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The 1/2" white insulation

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

14" X 14" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 15.75"H] 8" Round Duct Pipe + Product Details Size -+ Product Details Size 14"w X 14"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 15. 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