Aluminium exterior door L421 made to order

High-performance exterior aluminium door with thermal coefficient Ud 0.85 W/m²K and quadruple glazing for superior insulation. System depth 92 mm with articulated thermal break ensures lasting energy efficiency.

The L421 exterior aluminium door is the premium choice for contemporary constructions demanding exceptional thermal performance and refined design. The 92 mm system profile with 80 mm frame depth is engineered for maximum strength while maintaining superior insulation properties. Positioned in the premium segment for clients seeking European-standard quality and long-term reliability without compromise.

The leaf construction integrates 3 mm aluminium with an articulated thermal break of 34 mm, a technology that maintains thermal stability across the full profile width. The glazing represents a sophisticated solution: quadruple vitrage composed of 44.1 mm triplex, 5 mm satinato glass, and 44.1 mm triplex again—delivering not only outstanding thermal insulation but also substantial sound reduction from external noise. Triple EPDM gaskets seal the system, tested materials proven durable under extreme climate conditions.

Thermal performance Ud 0.85 W/m²K (ift Rosenheim certified) positions this door among the most efficient exterior solutions available. The combination of generously dimensioned thermal break and quadruple glazing creates an optimal barrier against heat loss. Mechanical resilience is guaranteed by the rigid profile structure, while triple EPDM gaskets ensure weathertight performance throughout the product's service life.

Standard sizing accommodates installations up to 1100×2300 mm, with possibility of larger configurations for single leaves reaching 1200×2500 mm. The system supports both traditional swing configurations and special opening variants, offering flexibility in spatial design. The door can be personalized to project requirements, with finishes and colours adapted to the architectural brief.

Recommended for villas, passive house projects, luxury developments, and any application where thermal and acoustic insulation are priorities. Compatible with modern and contemporary interior styles, L421 transforms the interior-exterior threshold into a technological and secure boundary. Installation follows European standards, ensuring compliance with latest building regulations and energy efficiency directives.

The L421 door achieves a Ud coefficient of 0.85 W/m²K, certified by ift Rosenheim, placing it in the premium performance category for exterior doors. This is due to the articulated 34 mm thermal break and the quadruple glazing system (44.1 triplex / 5mm Satinato / 44.1 triplex), which significantly reduce heat loss and enhance thermal comfort throughout the home.

The profile is manufactured from 3 mm aluminium, integrated into a 92 mm total width system featuring an articulated thermal break that ensures optimal insulation. The structure is designed for maximum durability and resistance to external factors, complemented by premium-quality glazing for long-lasting safety and aesthetics.

The quadruple glazing system (44.1 triplex / 5mm Satinato / 44.1 triplex) combines superior thermal efficiency with significant acoustic attenuation. The multiple layers of treated glass and spaces between them absorb sound vibrations, protecting the home from external noise, particularly in high-traffic areas or urban environments.

The L421 door uses three EPDM gaskets strategically positioned to create multi-point sealing across the entire perimeter, preventing air and water infiltration. EPDM material (synthetic rubber) ensures long-term elasticity, resistance to temperature fluctuations, and durability, maintaining insulation performance even after years of intensive use.

Standard dimensions are 1100×2300 mm for typical openings, with the option to reach up to 1200×2500 mm for a single door leaf with maximum flexibility. For projects with specific spatial requirements, the door can be custom-manufactured with personalized dimensions in consultation with our design specialists.

The system has a total depth of 92 mm with a frame depth of 80 mm, dimensions that adapt easily to most modern insulated constructions. Installation is performed with mechanical anchors and sealing strips, compatible with traditional masonry, brick, concrete, and thermal blocks, following certified installation standards.