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SF75 & SF75c

The new, highly insulated Sunflex SF75 is the market leader in folding sliding doors. It sets new parameters of insulating levels in folding door systems without compromising comfort or design. The slim profile of the frame matches that of the SF55 doors which enables maximum light into spaces. The frame on the SF75 has an extra 20mm depth, enabling the use of 48mm triple glazed units and a 44mm thermal barrier; this is where the higher levels of insulation come from.


The advanced technology used ensures that not only does the SF75 exceed current building regulations but any other likely stringent changes in the future.

• Exceeds current and future Doc L building regulations

• Suitable for any external Domestic or Commercial application

• Severe weather rated – tested and certified

• Sleek narrow sightlines and styling for that contemporary look

• Revolutionary slim profile with unrivalled 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

• With a centre pane u-value of 0.5W/m2K, an overall u-value of 0.9W/m2K can be achieved.


The Sunflex SF75 utilises the benefits of aluminium: durability, stability and robustness, narrow face widths and a variety of design options - even with large folding panels. For those who appreciate the feel and warmth of wood, the SF75c is for you, almost identical to the standard SF75 except for interior timber cladding which can be stained to create more traditional aesthetics.



The Sunflex SF75 is the most thermally efficient system in the market, triple glazed as standard provides an overall u-value of less than 1.0W/m2K. Narrow sightlines ensures maximum glass area and contemporary styling, without compromising the severe weather rating.


The aluminium frame profile is constructed from a strong aluminium extrusion, which has been thermally broken by a 44mm 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 frameworks are assembled with patented moulded 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.


Track Options

There are two choices of track; a standard stepped weathered track for a severe weather rated system or for added convenience and improved safety a thermally broken aluminium flush track recessed into the floor. This provides a level walkthrough with an uninterrupted floor finish, compliant to Doc. M of the Building Regulations for disabled access.


A severe weather rated system (the stepped weathered track) provides a perimeter double-rebated seal, with continuous triple gasket seals. (The system achieves DIN 18055, Category C performance for wind loading and water leakage.)


On the flush track the bottom seal between the door and the track is created by double, twin nylon brush piles separated by a twin fin seal, giving an effective seal. It is recommended that some form of a sunken drainage channel and a slope away from the doors be integrated, to avoid any pooling of water.


Minimal Finger Cushion Gaskets

The triple gasket seals between the door panels are continuous even behind the hinges and of superior quality (consisting of long lasting EPDM). The unique design of these self sealing gaskets, combined with centre bubble gaskets, provide a minimal gasket sightline while providing a cushion to minimise the effect if fingers were to be trapped.



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 SF75 can be made in &  the doors can either be opened to the inside or outside.



A high level of security is provided as standard, with an effortless, quick, smooth and easy operation. It consists of a two-point top and bottom shoot bolt mechanism, with additional central locking point to end lead door.


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, whilst compressing the panels tight against the top and bottom seals.


Five-lever key-locking cylinder

A five-lever Euro profile cylinder key lock and handles are fitted to the end lead door or single pass door where there are an odd number of panels, or to the first opening pair, in an even number of panels. These can be fitted to either the inside only or both internally and externally as required, meeting the requirements of the Association of British Insurers. By integrating the locking cylinder into the existing profile in this way eliminates the need for an additional add-on profile familiar with other sub standard systems, ensuring all sightlines remain symmetrically the same.


Added security options

Additional key locks can be added at every intermediate handle point for higher security. Mortice locks can be fitted where a latching position is required for added convenience. Panic locks can be fitted for fire escapes, electric latch-release locks and rollerball latch locks are also available for commercial use.


Internally glazed and locking hinge pins

For improved security all Sunflex folding doors systems are internally glazed as standard, with external centre secured locking hinge pins.



The SF75c is, at heart, the same product as the SF75 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.