Aluminium exterior door L351 made to order

Aluminum exterior door L351 with innovative system profile and superior thermal performance. Ideal for contemporary spaces requiring durability, efficiency, and reliable weather protection.

The L351 is an aluminum exterior door designed for projects prioritizing construction quality and energy performance. With a total system depth of 92 mm and frame depth of 80 mm, it delivers a robust proportion that integrates elegantly into contemporary facades. This series represents the optimal balance between structural solidity and thermal efficiency, created for high-end residential and commercial applications.

The core material consists of 3 mm aluminum profile with an articulated thermal break of 34 mm. This rupture solution ensures reduced thermal conductivity and maintains interior comfort even under extreme climatic conditions. The composite leaf has a total thickness of 92 mm and features quadruple glazing — 44.1 triplex / 5mm Satinato / 44.1 triplex — combining natural transparency with sound and thermal protection. Sealing is achieved through three high-quality EPDM gaskets, creating a dependable barrier against infiltration.

The thermal coefficient Ud of 0.85 W/m²K (certified by ift Rosenheim) positions this door in the superior energy performance category, meeting Europe's most stringent standards. The quadruple-glazed system significantly enhances acoustic insulation and thermal protection, reducing heating and cooling costs. The three-point sealing system prevents condensation and thermal loss at profile edges, ensuring long-term durability and reliability.

Standard dimensions offer good design flexibility — up to 1100×2300 mm for standard configurations and up to 1200×2500 mm for single-leaf installations. This accommodates diverse architectural openings without compromising system integrity. The door can be configured with various opening systems—swing, sliding, or pivot—according to space requirements and interior aesthetic preferences.

L351 fits perfectly into modern interiors, minimalist spaces, or projects combining aluminum with glass and steel. Compatibility with floor heating systems makes it ideal for passive houses and low-energy constructions. Anodized aluminum finish allows a broad personalization palette, from neutral tones to special metallic finishes.

The L351 achieves a thermal coefficient Ud of 0.85 W/m²K, certified by ift Rosenheim — an exceptional value for an aluminium exterior door. This means minimal heat loss and significant energy savings for heating, especially during cold months. The performance is ensured by the articulated 34 mm thermal break system and quadruple glazing panels.

The L351 has an aluminium structure with 3 mm thickness, system profile with a total depth of 92 mm, and quadruple glazing: 44.1 triplex + 5 mm satin glass + 44.1 triplex. The articulated thermal break of 34 mm protects the interior of the profile, and the 3 EPDM gaskets ensure long-term durability and resistance to weather, wind, and vibrations.

Standard maximum dimensions are 1100 × 2300 mm, but the L351 can be ordered in custom sizes up to 1200 × 2500 mm for a single leaf. This flexibility allows perfect adaptation to any architectural project, whether for large openings in a modern home or commercial façade. Recommendations for dimensions above standard can be obtained directly from our design team.

The L351 is equipped with high-quality hardware and multi-point EPDM sealing (3 gaskets) ensuring a hermetic and robust closure. The multi-point sealing system guarantees not only thermal tightness but also superior waterproofing and acoustic insulation. The closing mechanisms are designed for smooth and safe operation, with durability certified for tens of thousands of cycles.

The L351 requires minimal maintenance — regular cleaning with water and neutral detergent is sufficient. The aluminium finishes are treated to resist corrosion and fading, even in salty or polluted environments. EPDM gaskets and mechanisms should be checked periodically to maintain sealing performance long-term, but this is quick and easy.

The L351, with a frame depth of 80 mm and total system depth of 92 mm, is installed in compliance with European building standards and is compatible with standard masonry including brick, concrete, and other common materials. Installation requires level surfaces and a prepared sill according to sealing and thermal insulation regulations. We recommend consulting an authorized installer to ensure maximum performance and compliance with local building codes.