The SL50 is a capped ‘mullion drained’ curtain walling system designed to offer the highest performance through a combination of profile design and thermal optimisation. Offering complete flexibility of design and functionality, the SL50 has a range of glazing infills and face caps to suit any project. Our drainage and ventilation system, sited within glazing rebates, ensures an attractive finish with optimal weather performance. The system is available in a variety of mullion depths, as well as an enhanced thermal performance variant. For added design flexibility, the system can be faceted, curved or sloped, and drainage can be achieved through the mullion. The system has been tested to CWCT Sequence B and has been designed to be fully integrated with AluK window, door and brise soleil systems to provide a complete façade solution


  • 7.5° angles can be created with a faceted mullion without changing the glazing gasket
  • Hybrid mullion allowing a direct fix to steel / timber structures
  • Design features such as concealed vent options, purlin and eve details
  • Consistent slim 50mm sightlines throughout


  • 11 mullion and 9 transom options to overcome most design challenges
  • Concealed drainage options for maximum drainage efficiency
  • Glazing and infill range from 6mm-44mm
  • Variety of face cap options
  • Slim cap options available at 2.5mm
  • Fully integrates with AluK window and door systems