SUNFLEX Folding Doors
At Folding Future we have supplied and installed SUNFLEX folding or bifold doors for nearly 20 years. The reason we continue to fit these doors is simple, we believe they are the most advanced, highest quality and best performing doors on the market.At Folding Future we have supplied and installed SUNFLEX folding or bifold doors for nearly 20 years. The reason we continue to fit these doors is simple, we believe they are the most advanced, highest quality and best performing doors.
For more than thirty years SUNFLEX have been designing and manufacturing folding doors in Germany. Renowned for their advanced design and exceptional build quality, the SUNFLEX systems in aluminium, timber and composite are packed full of unique features you simply won’t find on any other folding door system.on the market.
Aluminium Folding Doors

SUNFLEX offer three choices of aluminium bifold doors, the SF55i, SF55s and SF75.
The SF55i combines narrow 115mm sightlines and slender 55mm frame depths and is perfectly suited for standard configurations, whilst the SF55s utilises the same frames but can be manufactured to incorporate more complex designs including creating open-corners and curved sets.
The SF75 is one of the most thermally efficient folding door systems on the market and perfect for those seeking an eco-build. The triple glazed system combines advanced thermal break technology with industry leading protection from wind and rain.
Packed full of German innovations such as exclusive anti-slam technology, a weathertight flush track and BSI Kitemark assured quality, the SUNFLEX bifold doors also benefit from outstanding security (including PAS 24 and Secured by Design accreditation) and a wide range of finishes to ensure the doors are perfect, whatever your project.
SF55i | SF55s | SF75 | |
---|---|---|---|
Frame depths | 55mm | 55mm | 75mm |
U-Value Double Glazed | From 1.6 W/m²k | From 1.6 W/m²k | From 1.2 W/m²k |
U-Value Triple Glazed | From 1.3 W/m²k | From 1.3 W/m²k | From 0.9 W/m²k |
Maximum panel width | 1200mm | 1200mm | 1200mm |
Maximum panel height | 3000mm | 3500mm | 3500mm |
Sightlines | 117mm | 115mm | 115mm |
BSI Kitemark™ | Yes. Certificate No. 643635 | Yes. Certificate No. 643635 | Yes. Certificate No. 643635 |
Secured by Design™ award | Yes | Yes | Yes |
Water tightness | To 300Pa (Class 7a) | To 900Pa (Class 9a) | To 900Pa (Class 9a) |
Air permeability | To 600Pa (Class 3) | To 600Pa (Class 3) | To 600Pa (Class 3) |
Anti-Slam technology | Yes | Yes | Yes |
Track options | 2 – weathered-flush or full weathered track | 2 – weathered-flush or full weathered track | 2 – weathered-flush or full weathered track |