Simple, Streamlined Aesthetics


The Dualframe 75 Si Reversible Window provides access to the exterior face of a vent from inside the building. 

This window system effectively rotates through 180° outside of the building line allowing easy cleaning of the aluminium window frame and the glazing. 

Using advanced polyamide thermal break technology, the Dualframe 75 Si Reversible window provides exceptional thermal performance without the need for costly and complex sealed unit specification.

Dualframe 75 Si Reversible Windows are designed to rotate on the exterior of the building, without interfering with interior design elements such as blinds and other fixtures. This makes them ideal for cleaning from the inside without impacting valuable internal space. 

The specialised profile range adds great flexibility when constructing windows where inward and outward-facing rebates have to be combined, without the need and expense of coupling sections or dummy frame to fixed lights. Universal frames can be used to create the most complex of screens easily combining casement, tilt before turn, and reversible opening lights, as well as inside and outside glazing. Combined with the option of having different finishes inside and out, the Si suite will give you endless choices.

For more information, see our brochure under the Documentation tab, or contact us.

Dualframe 75 Si brochure (pdf)

Product benefits


  • 24mm, 28mm, 32mm as standard
  • Vent weight up to 60kg
  • Glazing thickness up to 47mm


  • Awarded BSI Kitemarks for BS4871 and PAS 24
  • Concealed hinges within the frame, flush vents and flat profiles creates a simple, sleek aesthetic


  • Dual-Colour finish available allowing flexibility in internal and external design
  • Reversible vent and fixed light combinations including frame couplers and curtain wall interface
  • Compatible with all Dualframe 75 Si


  • Air Permeability - 600 Pa
  • Water Tightness - 600 Pa
  • Wind Resistance - 2000 Pa

More information

Projects using windows DUALFRAME 75 SI

Verde, Newcastle

United Kingdom
A total of 770 windows feature on the Newcastle’s student accommodation, Verde. This is the fourth and final phase of the £250 million Downing Plaza development - the largest planning application to be granted in Newcastle for a generation. Located on the former Hill Court Site, designed by award-winning architects SimpsonHaugh, this striking landmark set a new standard for student living in Newcastle.

Santara, Jersey

The project team responsible for a striking residential property in the Channel Islands have used Technal’s Dualframe 75 windows and the Elegance 52 curtain wall system, supplied by Pallot Glass & Windows, to match the property’s modernist styling, as well as to provide outstanding weather performance in a very exposed situation.