Bi-fold windows and doors can separate and connect two spaces seamlessly. Typically, a bi-folded window can have anything from two to up to seven leaf that are connected by hinges to create a consistent glass wall when closed. Bi-fold windows and doors attach to rollers on the top or bottom of the frame, a mechanism that allows bi-fold doors or windows to slide smoothly to open or close. Advantages 1. The leaf of the bi-folding window can be pushed to one side, which largely solves the problem of insufficient space. It is mainly divided into two types: side-mounted folding windows and push-pull folding windows. The size of the folding window that fits each space varies depending on the environment. 2. Bi- folding window also has the functions of heat insulation, heat insulation, moisture resistance, flame retardant, noise reduction, sound insulation and so on. 3. The folding window can be fully opened, which is very convenient for cleaning and wiping.