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ALUNA Bifold Doors

The ALUNA bifold system offers excellent security, maximum vision, weather resistance, easy installation, and unparalleled thermal efficiency. With a market leading sash size, uninterrupted views have never been easier to attain.
  • Sightlines of just 107mm from frame to sash
  • Pre-gasketed clip in bead
  • Part L compliant, with U-values as low as 1.1 W/m2K
  • Secure to PAS24 standards
  • Up to 14 leaves in total, 7 each way
  • Market-leading maximum sash size of 1200mm x 3000mm
  • Available in any RAL colours upon request
It also offers competitive energy ratings in spite of the added surface area glazing. Coming in at 1.4 W/m2K with double glazing and 1.1 W/m2K with triple glazing, creating an overall B grade energy rating. The engineering-grade components and premium quality materials used to built each door is made with a 10 year guarantee.

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Specifications & Performance

Weather Resistance

  • Water tightness class 9A (600 Pa)
  • Wind load resistance class A3 (1200; 1/150)
  • Weatherproof tested to BS6375 Part 1 : 2009


  • Market-leading maximum sash size of 1200mm x 3000mm.
  • Minimal sight lines of only 107mm or 120mm
  • 55mm threshold as standard, 20mm option available


  • Engineering grade running rollers for a smooth and silky opening and closing operation.
  • Trickle vents can be added
  • Glazing thickness up to 44mm

Energy Efficiency

  • Energy efficiency rated U-values as low as 1.1 U W/m2K and Door Energy Rated (DER) B to meet Part L requirements



Engineering Grade Hardware & Unique Components

The Bifold door comes with a 90 degree door restrictor, which can be attached & detached to allow you to open the door fully or 90 degrees. Additionally, it has a special lock keep that works with both the left and right sides of the doors, making ordering, stocking, and fabrication simpler.

The handles and locks are engineering-grade hardware that come in a range of stylish finishes that are designed for ease of use.


Double or triple glazing, with additional customisation options

The Aluna Bifold Door does offer double and triple glazing options, however, if you’re looking to add more glazing options, it has the option to add integral blinds, heritage style astragal bars, and transom to enhance aesthetics.


Available in Dual Colour Options & Any RAL Colours

The Aluna Bifold Door comes with the option of both matte and gloss finishes with all the popular colours in stock (including grey, black and white). It also Dual colour options which is held in stock, as well as having the option of the bifold door itself to be in any RAL colour on request.

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Installers and other businesses can only work effectively if they have a reliable trade supply service – offering the highest performing products. Luckily, here at Dempsey Dyer we only supply the latest options from market leaders. This guarantees quality, performance and durability – regardless of the product choice.


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