Aluminium exterior door L391 made to order

Aluminium exterior door with exceptional thermal insulation (Ud 0.85 W/m²K) and advanced quadruple glazing system. Sleek profile, maximum protection for modern homes.

The L391 exterior door represents the premium solution for principal access, combining contemporary design elegance with exceptional thermal performance. The aluminium series is engineered for homes requiring a secure and efficient barrier between interior spaces and outdoor conditions, without compromising the refined, understated lines of a modern façade.

The 3 mm aluminium profile is reinforced with an articulated thermal break system of 34 mm depth, ensuring structural stability throughout the door's operational lifespan. The overall system depth of 92 mm accommodates triple EPDM gaskets that seal the closure across three sides, maintaining consistent climate control. The patented quadruple glazing system—consisting of 44.1 mm triplex, 5 mm satin glass, and 44.1 mm triplex—delivers thermal and acoustic insulation with few equals in the exterior door category, dramatically reducing energy loss and external noise penetration.

Performance certified by ift Rosenheim laboratories confirms a thermal transmittance coefficient (Ud) of 0.85 W/m²K, positioning this door among the most energy-efficient options for homes with stringent comfort standards. The frame depth of 80 mm and leaf thickness of 92 mm create balanced proportions that integrate seamlessly into any wall opening. Standard dimensions up to 1100×2300 mm cover the majority of principal entrances, while the single-leaf variant extends to 1200×2500 mm for generous apertures.

Personalisation options encompass diverse aluminium finishes and opening systems tailored to specific requirements: single or double swing, pivot configurations for oversized openings, or sliding solutions for compact wall spaces. The triple EPDM gasket arrangement and articulated thermal break can be optimised according to the building's climate exposure and ventilation strategy.

Recommended for contemporary homes, renovation projects meeting high energy standards, and situations where the principal entrance must balance modern aesthetics with weather resistance. Integrates beautifully with solid wood flooring, minimalist design schemes, and open-plan living spaces requiring a sophisticated transition to the exterior environment.

Ud 0.85 W/m²K (certified by ift Rosenheim) indicates minimal heat loss — the door acts as a superior thermal barrier, retaining indoor warmth during cold seasons. This coefficient positions L391 among premium exterior doors, equivalent to optimized triple-glazed windows, resulting in significant heating cost reductions and enhanced comfort at the entrance point.

The patented glazing system (44.1 triplex + Satinato glass + 44.1 triplex) combines enhanced thermal inertia with sound diffusion — the outer triple layers ensure anti-burglary security, while the central frosted glass layer reduces unwanted reflections and provides privacy. For an exterior door, this configuration is critical: it maximizes thermal-acoustic insulation and delivers superior mechanical resistance to impacts and extreme weather conditions.

The articulated 34 mm thermal break is a composite spacer with low thermal conductivity inserted between the outer and inner aluminum profiles, preventing direct cold transfer. This is the foundation of the highly effective Ud coefficient — it reduces thermal bridging and maintains the temperature differential between the outer and inner faces of the door, preventing condensation and massive heat loss.

L391 can be customized — cataloged standard dimensions are 1100×2300 mm (dual-leaf configuration), but single-leaf versions reach up to 1200×2500 mm, offering flexibility for projects with specific opening requirements. Any size beyond these limits requires technical assessment, and a consultation with showroom specialists is recommended to ensure compatibility with existing frames and masonry.

The door features 3 multi-point EPDM gaskets that compress uniformly around the frame, creating a continuous barrier against wind and moisture. EPDM (ethylene-propylene elastomer) is the industry standard for extreme climates, providing thermal flexibility and long-term durability. Combined with the 92 mm profile and thermal break, the sealing system guarantees compliance with premium exterior door performance standards.

The system's total depth is 92 mm (80 mm frame), requiring a masonry opening with compatible thickness and level surface. Installation requires anchors, silicone or polyurethane adhesive, and proper ventilation to prevent condensation. We recommend on-site evaluation by specialists to verify wall flatness, drainage, and sill slope — essential for trouble-free long-term operation and preventing water infiltration.