Window stay for ventilation windows. The window stays sashes should be kept coupled in normal use. When using the window to ventilate, the window should be opened until the sashes lock in place. The resistor on the shutter can be adjusted to change the maximum angle of the window. Used for windows that open inwards with a casement between 32 mm and 138 mm.
Recommendation for use: in side-hinged windows 2 pcs and in addition for tall and wide windows 2 pcs hold-open device WF881 as additional friction holders or opening limiters. In top and bottom hinged windows, always 2 pcs/window. Also use always 2 pcs WF881 open-hold devices. When using the WF881 opening holder, the opening limiters of the WF250 must be removed.
