Bifold doors offer the widest opening spans available because the door panels fold neatly together. The result can be wonderful for creating an indoor outdoor experience between any family/living space and an el fresco or barbeque area. They are also popular in shop-front where a wide access is desirable. In day-to-day use a bifold door is usually closed, one door being available for passage whilst the others remain closed. Specialized insect screening is available for wider bifold doors.