balcony window

Simple, Streamlined Aesthetics


Developed upon the Dualframe 75 Si Tilt-before-Turn window, the Dualframe 75 Si Balcony window offers inward and outward openings with single and double door options.

Available with standard and low thresholds, this system provides exceptional performance thermally and for Air, Wind and Water Resistance.

The Dualframe 75 Si Balcony Window is suited for Juilet and other standard balcony applications. As with all Dualframe 75 Si windows, the Balcony window system was designed to achieve high thermal performance without foams or resorting to costly and complex sealed unit specifications.

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


  • Glazing up to 47mm allowing improved acoustic performance


  • Key-operated handle, with turn mode only with key inserted, minimises risk of user-injury and product damage
  • Secured by Design Accredited


  • 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 rating
  • Water Tightness - 600Pa / Class 9A
  • Air Permeability - 600Pa / Class 4
  • Wind Resistance - 2400Pa / Class E

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.