There are many unique applications of these Bi-Fold Windows. They provide a maximum view and airflow. It creates a connection between internal and external spaces. They are made up of a number of individual sashes that are hinged together. Most of these windows consist of 2, 3 or 4 window sashes. The number of sashes can be increased further. These windows are excellent for ventilation as they allow for large and wide-open apertures. They allow a controlled amount of air to flow through the house. They are not only used as servery windows but also used indoors. Similarly, it will provide us with a large space by expanding rooms indoor or out.