These locking window restrictors are great for child-safety and security and as an added bonus they are designed to be fitted on aluminium, wood or uPVC windows.
The opening angle would be restricted depending on how close to the hinge-side you have fitted the restrictor. Restriction is released by means of a key, in the event that you would like to open the window fully.
These are perfect to use on side-hung windows, and top-hung windows – and are best suited in our opinion to uPVC as they can be hidden away in the euro groove within the frame – however they can be surface mounted so there’s no issue there.
They can also be used on sash windows, and would in this case restrict the opening to 100mm (10cm) – unlike on hinged windows where you can vary this by placing it closer or further from the hinge side.