Aluminium Windows

Dualframe 75 Si

Tilt before Turn Window

Large Span Opening with Easy Cleaning and Maintenance


The Dualframe 75 Si Tilt before Turn (TBT) window uses advanced polyamide thermal break technology to provide thermal performance without the need to resort to costly and complex sealed unit specification. 

The Dualframe 75 Si Tilt-before-Turn windows are the ideal solution for high-rise or commercial applications, combining ventilation with large span openings and easy cleaning facilities. 

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.

System features of the Dualframe 75 Tilt before Turn (TBT)Window System: 

  • Unique operating action minimises the risk of damage to the product or injury to the operator. The handle is key operated and must be inserted to activate the turn mode. Once the window is closed it automatically defaults to the tilt only mode 
  • Concealed hinges within the frame eliminate colour matching issues and prevents clashing with plaster lines
  • Flush vents and flat profiles combine to create a simple and streamlined appearance
  • 88mm sightline maximises the viewing area without comprimising the U-value of the window system 
  • External beading requires no additional components to comply with BS7950
  • High class weather performance for water tightness, air permeability and wind resistance
  • Tailed gaskets and centre seals reduce thermal radiation and no costly foam inserts into the profile are not needed

Our brochure is available to download on the documentation tab above. 

Contact us for more infomation.

SAPA IE | Dualframe 75Si window brochure

Product benefits


  • 24mm, 28mm and 32mm as standard
  • Vent weight up to 100kg
  • Glazing thickness up to 47mm


  • Tilt-before-Turn and fixed lights available including frame couplers and curtain wall interface
  • Key-operated handle, with turn mode only with key inserted, minimises risk of user-injury and product damage


  • Dual-colour finish available allowing for flexibility in internal and external design
  • Concealed hinges within the frame removing colour matching issues
  • 88mm sightlines maximises viewing area and incoming natural light


  • Thermal Performance - A++ BFRC(UK) rating
  • Water Tightness - 600Pa
  • Air Permeability - 600Pa
  • Wind Resistance - 2400Pa