Bi folding doors
Interior Doors and their classification of way of opening : Bi Folding Doors
Quote from Article entitled Interior Doors and their classification of way of opening:
One of the most important things is a choice of construction. According to this doors are divided into:double-swing (pendulum);single-swing;rolling (coupe);folding (below framed);stable.
These doors open on both sides and are made mostly of masonite, glass, plastic or aluminum. They are rarely used in apartments, because they can’t provide reliable pressurization. Most often they are found in public places, at railway stations, in large supermarkets.
The full version of the article can be found here.