Aluminium exterior door L303 made to order

Aluminium exterior door L303 with 92 mm profile and high-performance thermal insulation Ud 0.85 W/m²K. Quadruple glazing and triple EPDM sealing for maximum protection.

The L303 door represents a premium solution for exterior access points requiring exceptional thermal performance and contemporary design. With a 3 mm thick aluminium profile and an articulated 34 mm thermal break system, it delivers superior insulation throughout the year. The compact profile design enables straightforward installation in both renovation and new construction projects.

This door's construction combines a 92 mm thick leaf with an 80 mm frame, optimizing rigidity and long-term stability. The quadruple glazing — 44.1 triplex / 5 mm Satinato / 44.1 triplex — provides outstanding acoustic protection and maintains interior tranquility. The three EPDM gaskets ensure impeccable sealing, preventing water infiltration and draughts even in demanding climatic conditions.

The thermal performance certified by ift Rosenheim with a Ud value of 0.85 W/m²K positions this door among the most efficient exterior access solutions available. The 92 mm total system depth adapts seamlessly to various wall types and installation methods, offering design flexibility. The robust construction maintains its initial performance over time without degradation.

Available geometries include standard variants up to 1100×2300 mm, with single-leaf options extending to 1200×2500 mm, permitting diverse configurations based on spatial requirements. Raw or treated aluminium allows aesthetic customization without compromising technical characteristics.

Recommended for main residential entrances, offices, and commercial buildings, the L303 integrates seamlessly into contemporary projects. The combination of exceptional thermal insulation and minimal design makes it ideal for spaces that prioritize natural light and external visibility while delivering uncompromising comfort and security.

The L303 achieves a thermal coefficient Ud of 0.85 W/m²K (certified by ift Rosenheim), significantly outperforming current European minimum standards. This is due to the quadruple glazing (44.1 triplex / 5mm Satinato / 44.1 Triplex), articulated 34 mm thermal break, and three-point EPDM sealing. This performance ensures measurable heat loss reduction and superior climate comfort during winter months.

The L303 is aluminum with a 92 mm profile and 3 mm leaf thickness, an inherently corrosion-resistant material requiring no protective coating for structural integrity. The door core and entire system benefit from a 34 mm thermal break that prevents condensation and moisture transmission to the aluminum structure. With three-point EPDM sealing and a total system depth of 92 mm, the door ensures optimal drainage and ventilation in all weather conditions, preventing water accumulation and weathering.

The L303 is available in standard dimensions up to 1100×2300 mm, but for a single leaf you can order custom sizes up to 1200×2500 mm. With a total system depth of 92 mm and frame depth of 80 mm, any custom dimension integrates seamlessly into existing frames and masonry. We recommend providing exact opening measurements and consulting our team to verify compatibility with the mounting system and structural stability for maximum-size requests.

The L303 features three EPDM gaskets functioning as a three-point sealing system — one on the outer frame, one intermediate, and one interior — ensuring perfect water and air isolation under all conditions. EPDM gaskets are elastic and UV-resistant; maintenance consists of regular cleaning with water and a soft cloth, avoiding harsh solvents that could damage the material. Every 12–18 months, we recommend visual inspection of the gaskets for damage and, if needed, light lubrication with neutral silicone on all moving contact points.

The L303 is built with 3 mm aluminum and quadruple glazing — a design offering very good structural resistance. However, for official burglary classification (RC2 or RC3), we recommend completing the system with high-security hardware (hidden hinges, certified multi-point locks) not included in the base specifications. Consulting a professional installer will ensure correct selection and installation of security fittings appropriate to your desired protection class, based on property location and specific risk assessment.

The L303 with 80 mm frame depth and 92 mm total system depth installs into any conventional masonry (brick, concrete, stone) or standard existing frames. Before installation, the opening must be checked for perfect rectangularity and flat support surfaces — any deviation will require additional frame preparation. For installation in masonry with external thermal insulation or special systems, we recommend coordinating with the installer to ensure compatibility with fixing brackets and continuous sealing.