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] 10" Diameter + Product Details Size –

+ Product Details Size – 32"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 18"h X 2"d (for duct opening measurement only)

With a 5" diameter for the duct opening measurement

Actual Filter Size – 31 3/4"w x 17 3/4" x 1"

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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] 10" Diameter + 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