Article #96 - What is a Projection Factor?

REScheck projection factor inputs.

The projection factor enables you to characterize the shading impact of horizontal overhangs or canopies that project outward from the plane of the window. The projection factor is the ratio of the distance the overhang projects from the window surface to its height above the sill of the window it shades.

In the figure shown, A/B = Projection Factor (2/4 = .5).