10"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 7.75"H] Copper Coil-Insulated Line Set Think of the diameter as

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

actual front end outer dimensions are approximately 18 5/8" width X 8 5/8" height -

Actual Filter Size – 7 3/4"w x 15 3/4" x 1"

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

order a 20x14

10"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 7.75"H] Copper Coil-Insulated Line Set Think of the diameter as+ Product Details Size 10"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 7. 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