The exterior bi-folding door system is designed for applications where wide openings are desired. It opens like an accordion and is perfect for connecting outside spaces such as patios and decks with inside spaces. There are a variety of configurations that designate the primary opening door, as well as how the other windows will fold. Some configurations such as 2 panels can only be opened from the interior while others allow the door to be operated form the interior or exterior.
The Bi-fold door most commonly opens outward however, an inward opening panel is available.