Menu
Product Menu

Aluminium bifold doors

Bring the Outside In

Award-winning bifold doors ideal for any home

Bespoke bifold door configurations available

Sunflex-trained and supported installers located nationwide

Aluminium Bifold Doors

35 Years of Bifold Door Innovation For more than 35 years SUNFLEX has led the way in the global design and manufacturing of industry-leading aluminium bifold doors.

With the enhanced requirements of Building Regulations, the SUNFLEX SF75eco offers the ideal combination of advanced thermal performance and stunning appearance. When stacked back the doors allow you to bring the outside in, creating completely unobstructed openings to connect your home and garden. When closed the advanced design and attention to detail help keep your home warm and the worst of the weather outside, out.

The SF75eco is manufactured with slender aluminium frames, featuring a patented 44mm thermal break, and is packed full of unique features not found on any other folding door on the market.

Like every SUNFLEX UK door, the SF75eco is handmade in a SUNFLEX factory, ensuring consistent manufacturing quality and genuine components throughout.

DOWNLOAD | SUNFLEX UK Bifold Door Brochure >>
Aluminium Bifold Doors
Key design features

KEY FEATURE 1
Industry leading thermal efficiency

Whilst you’ll dream of warm sunny days and opening your bifold doors up to step out on the patio, we know that when the doors are closed keeping your home warm and comfy is just as important. That is why we have designed SUNFLEX aluminium bifold doors to offer industry leading thermal performance standards.

The unique frame design of the SF75eco allows for better thermal performance with double glazing that other bifold doors can achieve with triple glazing, with the system even capable of achieving Passivhaus standards of efficiency.

KEY FEATURE 2
Keep the outside out

When it comes to bifold doors it is not just about keeping the warmth in, it is also about keeping the weather out which is why our bifold doors undergo rigorous independent weather testing in laboratory conditions to test their protection against air, water and wind.

Thanks to double rebated seals, not often seen on a bifold, the SF75eco can be designed to offer industry leading protection from the elements, ideal for everyone but particularly important for those in rural or coastal locations.

KEY FEATURE 3
Complete peace of mind

Keeping your home safe is at the core of the design of SUNFLEX bifold doors. With minimal hinge design and a multi-point locking system with shoot-bolts that extend into the top and bottom of the track and espagnolette locks securing the lead door in place.

Our bifold doors are all designed to comply with PAS 24 testing to meet the security requirements of Building Regulations Document Q* along with holding the prestigious Secured by Design™ award to meet the police preferred specification for security.

KEY FEATURE 4
Innovative locked 'part-vent' position

The innovative design of SUNFLEX bifold doors means they are capable of achieving things that no other folding door can; one example is the locked part-vent position.

When the doors are locked shut it is possible to turn the handle on one of the intermediate doors, partially opening the panels outwards to allow for ventilation without needing to unlock or open the doors themselves.

KEY FEATURE 5
Exclusive antiSLAM panel catch

A panel catch that holds the doors open is a crucial part of any bifold door, whilst some systems use a basic magnet, the exclusive SUNFLEX antiSLAM panel catch has been perfected over more than 30 years of research and development.

The innovative catch holds the lead panel in place as the doors are folded open, preventing the panels from accidentally slamming shut in the wind and keeping you, and the door system itself, safe. The innovative catch also ensures the doors are operated correctly, protecting the hinges and hardware and ensuring the doors continue to operate perfectly, time-after-time, year-after-year.

KEY FEATURE 6
Hidden in plain sight

The SUNFLEX bifold door handle is one of the exclusive features that really shows the attention to detail that has gone into the development of the system.

Whilst most other bifold doors use a basic backdoor handle, the exclusive colour-matched inline SUNFLEX handle is designed to sit completely within the outline of the frame – whether it is opened or closed. This ensures that you get more view through the glass with less interruption.

KEY FEATURE 7
Clever track design

As you would expect from a SUNFLEX bifold door, the track options feature clever design that combine functionality with real attention to detail. Uniquely our innovative low-threshold track matches a flush appearance with an effective weather seal, allowing you to create a stunning seamless transition between inside and out whilst still offering protection from drafts and rain.

For those seeking the optimum in protection from the elements the weathered track is a double rebated design where both the front and back of the panels seal against the track, perfect for even the most exposed locations.

KEY FEATURE 8
Your doors, your way

Whether it is the number of panels, the way the doors open or even just the colour of the frames, SUNFLEX bifold doors come with the widest range of configurations and design options of any folding door on the market.

From panels up to 3m tall, designs with open corners or even curved sets, through to doors with integral blinds within the glass (even with triple glazing) or fitted alongside insect screens, we customise your doors to the exact specification of your project, not to the limitations of the system, ensuring you get the finished installation your home deserves – your doors, your way.

Secured by Design PAS Logo Build It Awards Winner
Product

  • SF75eco

    Designed to be the most thermally-efficient bifold door, the SF75eco offers Passivhaus standard thermal performance and is specifically manufactured to accommodate a triple glazed sealed unit, and thanks to its advanced thermal break technology it can achieve an incredibly low U-value from just 0.8W/m²K† (based on a centre-pane of 0.5W/m²K) whilst maintaining the same usability and slender appearance that SUNFLEX UK doors are renowned for.

    Every SUNFLEX product is manufactured to strict standards of child safety. The SF75eco features an exclusive antiSLAM panel catch and finger cushioning gasket. Unlike typical magnet designs, the SUNFLEX Panel catch completely secures the lead door in place preventing the doors from being blown shut by the gusts of wind or from being operated by small children.

Specifications
SF75eco
Frame depths 75mm
U-Value Triple Glazed From 0.8 W/m²K†
With centre pane of 0.5W/m²K
U-Value Double Glazed From 1.3 W/m²K†
With centre pane of 1.0W/m²K
Maximum panel width 1200mm
Maximum panel height 3000mm
Sightlines 117mm
Secured by Design™ Yes
Water tightness To 900Pa (Class 9a)*
Air permeability To 600Pa (Class 4)*
Wind load To 2000Pa (Class 5B)
Unique Locking panel catch Yes
Track options 2 – low-threshold or weathered track
Double rebated frames Yes
Expand

* Water tightness and air permeability test performance is dependent upon a number of factors including system track option, system configuration and panel sizes.

† Thermal performance is dependent on glass specification.

Threshold

Threshold options

Our SUNFLEX bifold doors are available with a choice of two threshold options.

Our single rebated low threshold is ideal for creating a level transition between your home and patio or decking, featuring a 14mm upstand that is classed as an accessible threshold and meets the requirements of Building Regulations M.

Our double rebated weathered threshold features a 35mm upstand against the frames of the doors seal, providing the most comprehensive weather performance. Available with or without a sill.

Low threshold track
no sill

Weathered track
with sill

Colours

Colour options

All of our aluminium doors and windows are manufactured to the highest standards of performance and finishes with unrivalled attention to detail, including a premium powder coat finish which is cured on to the frames of the doors and more scratch-resistent and hardwaring than traditional liquid paint coatings.

For the perfect finish we have chosen a selection of the most popular colours for each system to hold in stock. In addition to our standard colours you can personalise your doors with a choice of more than 200 bespoke RAL colours.

SF75eco – standard colours

  • Anthracite Grey (RAL 7016) matt finish Anthracite Grey (RAL 7016) matt finish
  • Charcoal Grey Metallic (DB703) textured finish Charcoal Grey Metallic (DB703) textured finish
  • Jet Black (RAL 9005) matt finish Jet Black (RAL 9005) matt finish

SF75eco – popular bespoke colours

  • Slate Grey (RAL 7015) matt finish Slate Grey (RAL 7015) matt finish
  • Grey Aluminium (RAL 9007) semi-gloss finish Grey Aluminium (RAL 9007) semi-gloss finish
  • Traffic White (RAL 9016) matt finish Traffic White (RAL 9016) matt finish
  • Graphite Black (RAL 9011) matt finish Graphite Black (RAL 9011) matt finish
  • Sage Green (RAL 6021) matt finish Sage Green (RAL 6021) matt finish
  • Pearl Mouse Grey (RAL 7048) matt finish Pearl Mouse Grey (RAL 7048) matt finish

Why choose aluminium?

Aluminium is the perfect material for manufacturing bifold doors. It is strong and stable yet relatively lightweight, enabling us to create doors with slim frames that are maintenance-free.

To request a quote for a set of aluminium bi-folding doors, or any of our specialist door systems, use our postcode checker to find the nearest SUNFLEX distributor in your area.

Become an accredited distributor

If you are in the glazing trade join our distributor programme today and you’ll receive discounts on select showroom models, the choice of over 40 products for your inventory, and training and technical support directly from SUNFLEX UK.

Join
Find your local distributor