What is the Net Free Airspace for the 16 in. x 144 in. Rectangular White Built-in Screen Aluminum Soffit Vent?

The net free airspace for the 16", center-vent soffit is 6.48 sq. in. per lineal foot.

The net free airspace for the 16 inches, center-vent soffit is 6.48 sq. in. per lineal foot.