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Alunet doors
ALUNA Bifold
Bi-folding doors, single doors and French doors.
ALUNA Bifold is a luxury marine-grade aluminium system for bi-folding doors, single doors and French doors, developed as an enhancement of the BF73 platform with slimmer profiles and larger sash sizes. It combines market-leading sightlines, strong thermal performance and PAS 24:2022 security for contemporary residential projects.
The ALUNA Bifold system is designed to minimise visible framework and maximise glass area, with slim sightlines of just 107 mm and sash sizes up to 1200 mm wide by 3000 mm high per pane. It can be manufactured with up to 7 leaves each way, making it suitable for wide openings and statement glazing, while the same system can also be fabricated as single doors and French doors for a consistent whole-house look. Alunet highlights improved thermal performance with U-values as low as 1.1 W/m²K triple-glazed and 1.4 W/m²K double-glazed, plus PAS 24:2022 certification, BS 6375 weather testing, engineering-grade rollers, an integrated cill and a “Click & Forget” clip-in bead to support smooth operation and easier installation.
- The system uses the ALUNA Bifold platform for bi-folding doors, single doors, and French doors.
- Market-leading sightlines: 107 mm, with references to 107 mm or 120 mm minimal sightlines depending on configuration.
- Maximum sash size: up to 1200 mm x 3000 mm per pane.
- Maximum configuration: up to 7 leaves each way (14 in total).
- Thermal performance: U-values as low as 1.1 W/m²K with triple glazing and 1.4 W/m²K with double glazing.
- Energy rating: B (DER).
- Security: PAS 24:2022 compliant.
- Weather testing: tested to BS 6375 Part 1:2009.
- Door leaf capacity: 120 kg per leaf.
- Threshold options: 55 mm standard threshold, 20 mm low threshold, low threshold with rebate, and low threshold with ramps for accessibility-focused applications.
- Cill sizes: universal aluminium cills available in 90 mm, 150 mm, 190 mm and 230 mm.
- Additional features: optional adjustable jamb with ±4 mm adjustability, floating corner post option, trickle vents, door restrictor, shaped frames, sidelights, astragal bars, blinds in glass and solid panel inserts.
ALUNA Bifold is manufactured from marine-grade aluminium, chosen for its long-term durability, corrosion resistance, and strength. Alunet describes aluminium as a high-quality, hard-wearing material that resists the elements, will not rot, peel or flake, and requires far less maintenance than timber alternatives.
The system supports double and triple glazing, with brochure options also including integral blinds, heritage-look astragal bars and transoms, and solid panel inserts. These options allow the same BF73-based system to suit both modern and more traditional project styles.
ALUNA Bifold is available in any RAL colour on request.
ALUNA Bifold is supplied with a 10-year manufacturer’s guarantee.
ALUNA Slider
ALUNA Slider is a luxury aluminium sliding door system designed for large glazed openings, ultra-slim sightlines and smooth operation, with inline sliding as standard and lift-and-slide available as an option. It suits wide residential openings where thermal performance, security, and uninterrupted views are all priorities.
ALUNA Slider is designed to frame outdoor views and create bright internal spaces through large expanses of glass and minimal framing, with interlock options of just 25 mm or 50 mm. The system supports sash sizes up to 2.5 m x 2.7 m per sash and sash weights up to 250 kg, making it suitable for large feature openings to gardens, terraces and balconies. Engineering-grade hardware, stainless steel lamina on rail profiles, improved drainage, a PVC rail cover for added insulation and PAS 24:2022 compliance combine to deliver smooth operation, modern performance and strong security, with U-values as low as 1.4 W/m²K.
- Operation: inline slider as standard, with lift and slide as an option.
- Interlock sightlines: 25 mm super-slim interlock or 50 mm non-bonded interlock.
- Maximum sash size: up to 2.5 m x 2.7 m per sash.
- Maximum sash weight: 250 kg per door leaf.
- Track options: double track and triple track.
- Double track outer frame width: 120 mm.
- Triple track outer frame width: 183 mm.
- Bottom rail options: 42 mm and 34 mm wide.
- Thermal performance: U-values as low as 1.4 W/m²K.
- Energy rating: C.
- Security: tested to PAS 24:2022.
- Locking: multi-locking mechanism.
- Additional features: trickle vents, PVC rail cover for added thermal insulation and water protection, and two levels of water channelling with rubber tubular gaskets for sealing and drainage.
- Cill sizes: 190 mm and 230 mm.
ALUNA Slider is made from marine-grade aluminium and powder-coated to Qualicoat specifications. This provides long-term durability, corrosion resistance, structural strength and low maintenance for large-format sliding door applications.
The system is designed for double and triple glazed units, with options including integral blinds and laminated glass. Large glazed areas also help improve light levels and strengthen the visual connection between inside and outside spaces.
ALUNA Slider is available in Grey 7016 Matte, Black Matte, White 9016 Gloss, Grey 7016 Matte on White 9016 Gloss, and Black 9005 Matte on White 9016 Gloss. Any RAL colour is also available on request for bespoke projects.
ALUNA Slider is supplied with a 10-year manufacturer’s guarantee.
Book your aluminium door survey
Create brighter spaces, wider openings and a cleaner modern finish with professionally installed aluminium doors. Speak to Citi Homes Windows today to book your survey and get a quote for your project.