10" X 4" [Duct Opening] 2-Way Vertical Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Color_Red Oak Wood Think of the diameter as

Think of the diameter as a straight line from one end to the other

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

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+ Product Details Size – 24"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 26 5/8" height

10" X 4" [Duct Opening] 2-Way Vertical Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Color_Red Oak Wood Think of the diameter as+ 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