1) The system is under the locked status while the handle shaft is 0 degree;2) When the shaft is rotated to 90 degrees, the system is unlocked, meanwhile, under the assistance of pneumatic position stay, it needs to be pushed lightly to open the window sash.3) Open the window sash to the advanced position, then rotate the handle shaft to 0 degree, at this moment, the system is locked automatically, while the window sash bears the wind pressure to some content the window will be cl...
1) The system is under the locked status while the handle shaft is 0 degree;2) When the shaft is rotated to 90 degrees, the system is unlocked, meanwhile, under the assistance of pneumatic position stay, it needs to be pushed lightly to open the window sash.3) Open the window sash to the advanced position, then rotate the handle shaft to 0 degree, at this moment, the system is locked automatically, while the window sash bears the wind pressure to some content the window will be closed automatically, the locking component will be locked automatically to prevent the window from damaged.

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