The window has an automatic safety restrictor which restricts the initial opening to about 100mm (until it is released). The safety restrictor, on the left-hand side of the window, is released by pushing the button marked PRESS until it passes the two stops in the aluminium channel.

Subsequently, question is, how do you fit a concealed window restrictor? - Pull the window in towards the closed position to engage the restrictor.

To fit a concealed window restrictor simply:

Select the restrictor and fit the restrictor arm. Insert the restrictor stud. Engage the restrictor and complete final checks.

Simply so, what is a window restrictor?

Window restrictors allow the opening of a window to be restricted, which is useful from both a security view point and the safety of residents within a property, particularly children.

How do you open UPVC windows outside?

Open the window until it is fully open. Press down the button on the bottom hinge and move the window slightly to the handle side to release the hinge. Repeat the process for the top hinge. Now the window is free to slide along the track to allow for easy access to clean the windows.