Security and locks
With the opening restrictor, you can regulate the extent to which your VELUX roof window opens. the window is still capable of being opened to provide you with ventilation, but if you want to open the window beyond this point and/or release it for cleaning, you need a special key to do so (the ZOZ 011 that you can buy separately).
Restrictions of opening the roof window, beyond the general safety level, security lock made of steel can be used. When the safety device is locked, it is not possible to open the sash, but the ventilation function of the window will still work.
Please note that opening restrictor and security lock cannot be used on top hung roof windows