Aluminium exterior door L991 made to order

Aluminium external door with slim profile and superior thermal performance. ift-certified with quadruple glazing and triple-seal system, ideal for contemporary architectural projects.

The L991 model represents the premium exterior aluminium door solution for highly efficient buildings. Engineered with a 92 mm system depth, this door combines slender architectural lines with certified thermal performance. The structural design optimises natural light penetration and visual transparency whilst maintaining the rigidity and sealing integrity required for lasting protection.

Structurally, the 3 mm aluminium profile incorporates an articulated thermal break of 34 mm, significantly reducing heat transfer between interior and exterior environments. The glazing is sophisticated quadruple configuration—layered as 44.1 triplex, 5 mm satin glass, then 44.1 triplex—delivering superior thermal insulation and selective privacy. The triple EPDM gasket system across three contact levels ensures watertight and airtight performance, even under severe weather exposure.

Thermal performance is verified by ift Rosenheim testing, delivering a Ud coefficient of 0.85 W/m²K, positioning this door among Europe's high performers. This value reflects the energy efficiency that reduces heat loss and lowers heating costs over the door's lifespan. Robust construction and integrated drainage systems ensure durability and functional reliability across climate zones and exposure conditions.

Dimensional flexibility is significant—standard configurations accommodate up to 1100×2300 mm, whilst monolithic leaf arrangements extend to 1200×2500 mm. The frame sits at 80 mm depth, with the leaf at 92 mm, proportions that support both door geometry and the performance of the multi-layered glazing system. Opening systems (hinged, sliding, pivot) and finishing options adapt to project specifications.

Ideally suited to premium residential projects, high-specification commercial buildings and superior renovation work, the L991 integrates seamlessly with matching aluminium windows and contemporary or minimalist interiors. The door performs optimally with marble flooring, solid wood, or designer tile systems, creating a coherent and refined entrance aesthetic.

The L991 achieves Ud = 0.85 W/m²K, certified by ift Rosenheim, placing it among the highest performance levels for aluminium exterior doors. This value reflects the quadruple glazing system (44.1 triplex + satin glass + 44.1 triplex) and the 34 mm articulated thermal break, ensuring optimal thermal comfort and energy efficiency in cold seasons.

The satin glass in the middle (5 mm) serves both thermal and aesthetic functions, diffusing natural light while reducing reflections for an elegant matte transparency. The 44.1 triplex layers on both sides ensure stratification and anti-intrusion safety, while the three-layer combination delivers superior acoustic insulation and a contemporary appearance ideal for minimalist architectural projects.

L991 features a total system depth of 92 mm with aluminium profile thickness of only 3 mm, enabling a very slender proportion and minimalist visual presence, ideal for contemporary design. The structural core with a 34 mm articulated thermal break ensures rigidity and performance, while the door leaf at 92 mm thickness maximizes usable space within the door opening. The 80 mm frame depth integrates elegantly into any construction with installation versatility.

L991 offers standard dimensions up to 1100 × 2300 mm in single-leaf configuration, and up to 1200 × 2500 mm per leaf, covering most standard applications. For projects requiring customization, the door is available to order in custom dimensions, allowing adaptation to any specific opening and seamless facade integration. Contact the showroom for sizing options and multi-leaf configurations.

The L991 uses three EPDM gaskets (synthetic elastomer) strategically positioned at different points of the frame and leaf to create a multi-point sealing barrier. The first gasket protects against rainwater and moisture infiltration at the outer edges, the second ensures thermal and acoustic continuity, while the third seals interior spaces to prevent air leakage. This triple configuration eliminates cold bridges and maintains building integrity over time.

L971 with its 80 mm frame depth is installed in wall openings using anchors and polyurethane foam, ensuring precise vertical and horizontal alignment. Frames must be straight and level, with the gap between frame and wall filled with insulation and sealant to prevent water and air infiltration. After installation, the door requires hinge adjustment and closing mechanism tuning to ensure smooth operation. Professional installation is recommended to guarantee thermal and acoustic performance under use conditions.