This traditional heavy duty framing system, 32mm wide with 5mm thick flanges, was originally developed for commerical and industrial applications. It can accommodate single and insulating glass units up to 20mm thick. It can be divided into small panes with welded tee glazing bars of 28mm wide or alternately can be totally glazed to maximize your view. Available in fixed screen, opening sash windows, sliding and bi-fold configurations. Primary used for Architectural residential applications.