SUNFLEX Bi-Folding Doors

All SUNFLEX bifold doors are backed by more than 30 years of folding door experience, with the brand renowned around the world for designing and engineering high quality doors that are packed full of unique features not found on any other manufacturers’ doors. The popular SF55i and ultra-thermally efficient SF75 systems offer the ideal options for those seeking the ability to completely open up their doors and breakdown the boundaries between inside and out.


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Anti-slam technology - All SUNFLEX bifold doors are designed with patented anti-slam technology that prevents the doors accidentally swinging shut in the wind. The lead-door of the system features an exclusive panel-catch that secures it in place when the doors are open.

Advanced thermal and weather performance - the ultra-thermally efficient SUNFLEX SF75 can achieve incredibly low U-values from just 0.9W/m²K when triple glazed, which combined with industry leading wind and rain (water tightness - 900pa | air permeability – 600pa) test performance ensures the doors are perfect for even the most exposed locations

Flush floor finish - SUNFLEX UK offer an exclusive choice of fully-weathered or low-level flush track for their bifold doors. The low-level flush track includes a 14mm upstand that combines an effective weather seal whilst maintaining a seamless transition from inside to out, whilst the advanced fully-weathered track is the ideal option for exposed or rural locations.

Exclusive handle design - All SUNFLEX UK bifold doors are finished a handle that is sighted in-line with the frame of the door to provide a completely uninterrupted view through the glass. This attention to detail in handle design is exclusive to SUNFLEX bifold doors, creating a sleek and contemporary appearance when the doors are closed.

Versatility of design

The advanced engineering of SUNFLEX bifold doors ensures they can be effortlessly operated, even with panel sizes up to 1200mm wide and 3000mm (SF75 – 3500mm) high. Every SUNFLEX bifold door is custom made and with the widest range of configurations and design options the doors can be customised to meet the exact requirements of your project.

SUNFLEX Bi-Folding Doors

The popular SF55i and ultra-thermally efficient SF75 systems offer the ideal options for those seeking the ability to completely open up their doors and breakdown the boundaries between inside and out.



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