Aluminium bifold doors

Bring the Outside In

More than 20 years of manufacturing specialist door systems

Superior designs made bespoke to all requirements

Sunflex-trained and supported installers located nationwide

Aluminium Bifold Doors

For over thirty years, SUNFLEX has led the way in the design and manufacturing of industry-leading aluminium bifold doors.

Combine the comfort and security of the indoors with the tranquillity and freedom of the outdoors. Featuring large glass panels with slender sightlines, SUNFLEX aluminium folding doors are the perfect accompaniment to a picturesque garden or rural landscape.

The SUNFLEX range includes three aluminium systems: the SF55i, the SF55s and the SF75, each designed for specific uses and configurations and all packed full of unique features not found on any other folding door.

Every SUNFLEX door is handmade in a SUNFLEX factory, ensuring consistent manufacturing quality and genuine components throughout.

Features
  • Aesthetic appeal Stunning frame depths from just 55mm and panel widths up to 1200mm to maximise glass
  • Advanced security protection Carries prestigious Secured by Design™ award and exceeds requirements of PAS 24:2016 testing
  • Industry-leading performance Superior water tightness (900Pa – Class 9a) and air permeability (600Pa – Class 4) testing performance
  • Easy to operate Ultra-smooth operation backed by more than 30 years of folding door development
Kitemark Secured by Design PAS Logo Build It Awards Winner
Products

We offer three aluminium bifold door systems: SF55i, SF55s and SF75. Discover the unique features of each model and find your perfect SUNFLEX bifold door system.

  • SF55i

    Designed with incredibly narrow 55mm frame depths, the SF55i is our best-selling aluminium bifold door and ideal for standard configurations in extensions, renovations or self-build homes. The square-edged profile and slim sightlines help maximise the amount of glass and break down the boundaries between inside and out.

    The advanced multipoint locking system of the SF55i provides unrivalled security. It features a combination of side locking on the lead door panel and hidden top and bottom shoot bolt locking on the remaining panels. Unique to SUNFLEX bifold door systems, the top and bottom shoot bolt locks can be upgraded to a twin lock.

    Brochure
  • SF55s

    Capable of creating more complex configurations, including moveable corners or for openings requiring panels up to 3500mm high, the award-winning SUNFLEX SF55s provides the perfect combination of ultra-smooth operation, contemporary appearance and advanced weather performance.

    SUNFLEX aluminium bifold doors are highly customisable, with a choice of 5 standard frame colours or over 200 from our premium RAL colour range so you can colour match the handle to blend with the frame, or embellish with stainless steel. If you live nearby to a swimming pool/chemical environment or are within 5,000 metres of the coast, we can pre-anodise and powder coat the aluminium frame for the optimum protection from chemical damage.

    Brochure Technical
  • SF75

    Designed to be the most thermally-efficient bifold door, the SF75 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 0.9W/m2K whilst maintaining the same usability and slender appearance of the SF55s.

    Every SUNFLEX product is manufactured to strict standards of child safety. Each aluminium bifold door features an automatic panel catch and finger cushioning gasket. The SF55s and SF75 models include a stacking clip to hold the doors open, preventing unwanted movement by the wind or small children.

    Brochure Technical
Specifications
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
BSI Kitemark Secured by Design™ 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 4) To 600Pa (Class 4)
Unique Locking panel catch Yes Yes Yes
Track options 3 – flush, low-threshold or weathered track 3 – flush, low-threshold or weathered track 2 – flush, low-threshold or weathered track
Double rebated frames Yes Yes Yes
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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

Weathered Threshold

Colours

Colour options

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 RAL finishes and even opt for different colours on the interior and exterior frames of the doors to perfectly match your home.

SF55i – standard colours

  • Anthracite Grey (RAL 7016) matt finish Anthracite Grey (RAL 7016) matt finish
  • Slate Grey (RAL 7015) matt finish Slate Grey (RAL 7015) matt finish
  • Graphite Black (RAL 9011) matt finish Graphite Black (RAL 9011) matt finish

SF55s and SF75 – standard colours

  • White Aluminium (RAL 9006) semi-gloss finish White Aluminium (RAL 9006) semi-gloss finish
  • Grey Aluminium (RAL 9007) semi-gloss finish Grey Aluminium (RAL 9007) semi-gloss finish
  • Anthracite Grey (RAL 7016) semi-gloss finish Anthracite Grey (RAL 7016) semi-gloss finish
  • Traffic White (RAL 9016) semi-gloss finish Traffic White (RAL 9016) semi-gloss finish
  • Anodised Silver Anodised Silver
Hotspots

Experience SUNFLEX bifolding doors

Click the play button below to view a demonstration of our bifolding doors. To explore the features in more depth, simply click on the plus buttons for more information.

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    Burglar-resistant fittings

    Burglar-resistant fittings

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    Assembly shoes allow a fast assembly and precise adjustment of the vertical frame profiles

    Assembly shoes allow a fast assembly and precise adjustment of the vertical frame profiles

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    Meets and exceeds the requirements of PAS 24:2012 to achieve Building Regulations Approved Document Q security standard

    Meets and exceeds the requirements of PAS 24:2012 to achieve Building Regulations Approved Document Q security standard

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    Panel catcher for additional security to fix the pass door to the adjacent panel

    Panel catcher for additional security to fix the pass door to the adjacent panel

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    Optional twin-lock-mechanism

    Optional twin-lock-mechanism

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    Mushroom-head lock for optimal tightness and increased security

    Mushroom-head lock for optimal tightness and increased security

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    Options from Sunflex handle series

    Options from Sunflex handle series

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    Different kinds of locks available

    Different kinds of locks available

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Sunflex UK

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, visit 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.

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