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Sunflex SF55

Sunflex SF55
Sunflex SF55


Exceeds current and future Doc L building regulations

Suitable for any external Domestic or Commercial application

Severe weather rated – tested and certified

Sleek narrow sight lines and styling for that contemporary look

Revolutionary slim profile with unrivaled thermal properties

Minimal cushion finger gaskets

New stainless steel both top and bottom running carriages

Lightweight construction and simple assembly

Discreet hinges

Meets the Association of British Insurers requirements

Virtually maintenance free

When first released the SUNFLEX SF55 was a revolutionary new development; designed to shape the future of the folding door market. Not only does it provide a small profile width of only 55mm, in addition to narrower sight lines maximising glass area, it boasts of an unrivalled 24mm patented shaped polyamide thermal break. With a double glazed unit, offering overall U-values of 1.5W/m2K, the SF55 is also available with internal timber cladding for a more natural finish.



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Designed predominately to be bottom running, the stainless steel running mechanisms consists of four wheels, manufactured from tough glass fibre reinforced polyamide, set around a maintenance-free sealed ball-bearing, giving a quiet, smooth operation with optimum resistance to extreme weather and temperatures fluctuations. Each wheel and guide mechanism can carry up to 200 kilograms.


The advanced pioneered technology in this system is designed to be completely fitter friendly and upon installation enables the height of the system to be easily adjusted with the simply use of an Allen key.


Self-lubricating collar type bearings provide quiet operation without squeaking hinges.


There is a vast range of different configurations the SF55 can be made in - see below for the full range. The doors can either be opened to the inside or outside.

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The SF55 profile is constructed from a strong aluminium extrusion, which has been thermally broken by a 24mm polyamide insulation bar, guaranteeing it optimum resistance to combat heat loss and condensation. The minimal framework is offered as a (WE) square edge profile.


All framework is assembled with patented molded corner blocks and the panels are machine mitred at the corners rather than the cheaper butt jointed alternatives. Each panel is connected to the next panel/outer frame by a minimum of 3 slim line hinges, ensuring an even, continuous seal around the perimeter of each door panel.


A high level of security is provided as standard. With an effortless, quick, smooth and easy operation consisting of a two-point top and bottom shoot bolt mechanism, with additional central locking point to end Lead door the SF55 is one of the most secure folding, sliding doors available on the market. 


The locking system is incorporated within the framework within each intermediate panel, operated by an internal flush handle. The shoot bolt rods are manufactured in aluminium and linked by a corrosion resistant cam. In addition, they are capped with polyamide cones that prevent any metal damage to the tracks when locking and whilst compressing the panels tight against the top and bottom seals.


The SF55c is, at heart, the same product as the SF55 but with one difference - timber cladding.


With timber cladding on the internal faces of the doors, a truly natural, warmer feel can be achieved by finishing your choice of timber in a natural stain. Pine or Meranti timber is available.


On the timber cladding there are two types of milling finish - either a rounded edge or a straight edge.


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