There are many kinds of building doors and windows. As a whole, it includes two major categories: Industrial and civil doors and windows. Internationally, the doors and windows are divided into four generations according to the order of the development of functions:
The first generation is lighting windows, ventilation doors and windows, perspective or lookout doors and windows;
The second generation is enclosure or safety doors and windows, decorative doors and windows;
The third generation of energy-saving windows, insulation windows, heat insulation windows, sealed windows, noise windows and anti-corrosion windows;
The fourth generation of intelligent window, including breathing window, induction window, remote control window and window bio environmental protection.
Doors and windows in accordance with the development of productivity dating, in essence, according to the different materials of the doors and windows put into use order to date, can be divided into three generations:
The first generation was wooden doors and windows;
The second generation of metal doors and windows, steel doors and windows, including windows and doors, windows and other Aluminum Alloy Tongmen (due to copper doors and windows is only a process of high-grade doors and windows, in recent years the market share is very low, this will not be discussed.)
The third generation of plastic doors and windows, including PVC doors and windows and glass fiber reinforced plastic doors and windows and so on.
At home, usually in the industry is in accordance with the order of time to the doors and windows dating, that is, wood doors and windows, steel doors and windows, aluminum alloy doors and windows, PVC doors and windows and glass fiber reinforced plastic doors and windows five generations.