1.Ventilation: The below pushed out space make the room and outside air natural circulation, indoor air fresh, while excluding the possibility of rain into the room. The fresh air undoubtedly creates a comfortable living environment for people.

2.Security: The linkage hardware arranged around the sash and various functions of them to operate inside room. When the window sash is closed, all sides are fixed on the window frame, so the security and anti-theft performance is excellent.

3.Easy to clearing: Makes it easy and safe to clean the exterior surfaces of windows.

4.Practicability: Avoid the interior space occupied when the inner window is opened, it is convenient to hang the curtain.

1.The top hung window can be opened by swivel the handles. When used at ordinary times, the action should be light and gently pull and push, do not use violence. For long term use, add a little oil for lubrication.

2.When using the top hung window, the push-pull track should be cleaned frequently to keep it clean. To make the surface of the orbit and groove free of hard particle matter.

3.When clean it, the person cannot step on the frame, also do not pull frame to make support, otherwise frame can be pull out of shape, then cause window to push pull difficulty.

4.The glass sealing and sealing strips on windows are the key structures to ensure the sealing. If they fall off, should be repaired and replaced in time.