CE certificate of doors and windows:
The door and window become more important to us in use and function, while people pay more attention on space quality of living. On technology, door and window shall have some special function, including water tightness, air permeability, resistance to wind load, mechanical strength, thermal insulation, sound insulation, guard against theft, easy to operate, etc. moreover, door and window are the representative of culture sight of terrain. They are the design element of architect, and the symbol of owner’s personality shown.
Anyway, window and door are the bridge of communication between people and environment, and they are closely bound up our daily life.