Awning window is a special type of aluminum alloy doors and Windows. The sash of the suspended window can be tilted outward or inward to open at a certain Angle, preserving the ventilation function while avoiding occupying indoor and outdoor space when fully opened. The design of the suspended window makes it have a good anti-theft performance, because even if the window sash is broken, it can not easily enter the room from the outside. However, the awning window has a limited opening Angle and may not be able to meet some special ventilation needs