They allow a window to be partially opened for ventilation purposes whilst preventing it being opened wide enough for a person to climb through.
Window opening restrictors.
A window child lock restrictor is purely to reduce the risk of falling out of a window.
Window restrictors are a security lock affixed to any type of window which allow room ventilation whilst limiting the opening distance.
This is a carefully considered range of window restrictors window restraints and window limiters for your upvc aluminium or wooden windows.
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.
Ebay lists a vast array of devices which can be simply fitted to suit all windows.
Hello chippingmark the opening gap is the distance from the edge of the frame to the inner edge of the window and can be adjusted dependant on where the restrictor is mounted.
100mm is the industry standard fit as it is estimated that a baby could not fit through a 100mm opening and fall out the window.
This is to prevent someone either entering or exiting and the opening gap is typically 10 cm.
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Typically sash restrictors are fitted 100mm above the mid rail so that the window can only be opened by 100mm.