Aluminium Windows


Reversible aluminium window

Simply stunning aluminium window


The Dualframe 75 Si Reversible aluminium 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 aluminium 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.

System features of the Dualframe 75 Si Reversible aluminium window: 

  • Ease of internal cleaning of vents and aluminium frames with minimal impact on interior design elements
  • Tailed gaskets and centre seal reduces thermal radiation with no foam inserts needed
  • External beading requires no additional components to comply with BS7950
  • Superior thermal performance is achieved with a unique polyamide thermal barrier
  • Highest class weather performance for water tightness, air permeability and wind resistance

Design features of the Dualframe 75 Si Reversible aluminium window: 

  • Concealed hinges, flush vents and a flat profile ensures a simple, streamlined aesthetic and prevents a clash with plaster lines
  • 88mm sightline maximises viewing area and increases incoming natural light - all without compromising the U-value of this window system

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

Book on our Product Introduction Training online.

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

Technical manual

Technical Manual Access

Our technical manuals are available for our customers to view after registration

If you are a customer who cannot see these after logging in, please contact your Account Manager or Customer Service Representative for assistance. 

Projects using aluminium windows DUALFRAME 75 SI

Heathervale House, Tunbridge Wells

United Kingdom
Installed alongside some interesting brass architectural detailing, TECHNAL aluminium window, curtain walling and doors have been specified and installed at Heathervale House - transforming the outdated office development.

New Garden Quarter, Stratford

United Kingdom

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.

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.

Stapleton House, London

United Kingdom

Stapleton House is a design and build project by Balfour Beatty Construction Services who created 862 high specification student spaces across nine floors in the large and logistically challenging student accomodation project in North London. 

The property is located by the very busy Holloway Road and therefore needed an enhanced acoustic rating for each elevation facing the public highway, as well as the achievment of high thermal, weather and security standard throughout. 

The fabricator Sealtite, along with the Technal UK technical support team duly delivered a proposal of Elegance 52 curtain walling and the Dualframe 75 Si windows and provided detailed drawings, strength calculations, thermal calculations and information on acoustic testing. 


Ysgol Penyffordd, Wales

United Kingdom
Selected for their weather, thermal and security performance, TECHNAL aluminium curtain walling, windows and doors was specified and installed at Ysgol Penyfford - a £7 million-pound primary school located in the Flintshire villlage of Penyfford in Wales. This project has been constructed to BREEAM Excellent standards.