The friction brake does not se-
cure the sash's position during
strong winds or draughts.
18
Function and operation | Top guided
Top guided
The ironmongery to the head detail come in
a variety of types all with a fixed centre of
rotation close to the upper edge of the sash.
The window is supplied with a handle as
standard.
When the window is opened, the bottom
part of the sash is pushed forward, while
the top part remains in position. The sash
can be held in a random ventilation position
by means of the built-in friction/opening re-
striction device in the sash's sides. Friction
can be tightened or loosened by adjusting
the friction bolt in the ironmongery on the
side of the sash.
The receiver has two slots, the inner slot is
for closing the window, while the outer slot
produces a gap at the bottom of 10-20 mm
for a night ventilation facility which can be
securely locked in position.
On top hung windows the hinges are moun-
ted in the frame rebate and on the edge of
the sash which means that the hinges can-
not be unscrewed from the outside.
