The Bi-fold Patio Door maintains a unique and innovative system of folding panels that can be adjusted towards one side, or divided between the right and left side of the frame. In between each panel is a thick, protective weather seal that also serves as a safeguard against accidental finger closure between the panels. Incorporated into the Bi-fold door is a pleated, retractable insect screen, as well as a two-point locking system. The top-hung mounting system reduces resistance, and creates an overall effortless operation.