Window restrictors and stays
Under this category, you can find the parts that allow you to limit the opening angle of aluminium windows.
NOTE:
For safety reasons, window stays should also always be fitted to hopper-windows operated by means of a manually operated fanlight opener or chain actuator.
The reason for this is that a fanlight opener or chain actuator can easily be disconnected (e.g. for maintenance or cleaning) from the sash.
The risk of this is that the window could then fall fully open, resulting in injury and damage.