Steel reinforcement
A significant increase in the window's stability is achieved by installing steel reinforcements all the way around the outer frame and the sash (right into the mitred corners). Only this detail allows the corner bearing and the restrictor stay to be screwed into the steel core with all four screws. This continuous screw fixing is required to provide a load-bearing capacity of over 100 kg. The dimensional stability of the profile construction makes it possible to produce large elements.
