Aluminium exterior door L437 made to order

Aluminium exterior door with exceptional thermal insulation (Ud 0.85 W/m²K), featuring quadruple glazing and triple-level sealing. Engineering excellence for high-performance entryways.

The L437 model represents a fully engineered solution for thermal and acoustic protection of exterior entryways under demanding climatic conditions. The extruded aluminium profile, with a wall thickness of 3 mm, is reinforced by an articulated thermal break of 34 mm, which completely interrupts heat transfer. This configuration allows the Ud coefficient to reach the certified value of 0.85 W/m²K according to ift Rosenheim testing—a performance that places the door in the premium category for exterior access insulation.

The total system depth of 92 mm, combined with a frame profile of 80 mm and leaf thickness of 92 mm, ensures a robust structure and precise compatibility with various wall types and finishes. The glazing system comprises a quadruple configuration—44.1 triplex, interrupted by a 5 mm Satinato interlayer, then 44.1 triplex again—delivering cumulative thermal insulation while providing exceptional acoustic control. Three-level sealing with EPDM gaskets maintains air and moisture retention regardless of direct wind exposure and heavy rainfall.

This door system's performance exceeds European standards for passive and climate-controlled buildings. The profile depth permits installation across a wide range of construction scenarios, from new builds with external insulation to renovations with existing frames. Maximum dimensions—up to 1200×2500 mm for single-leaf and 1100×2300 mm for standard dual systems—cover the majority of high-end residential and commercial entry typologies.

Customization is comprehensive: various opening systems (single swing, double swing, pivot), glazing configurations, and finishes across modern colour palettes are available. The door integrates seamlessly into contemporary minimalist concepts or revised design, where the refined profile line and symmetric glazing create an expression of precision and elegance.

This exterior door is recommended for luxury homes prioritizing energy efficiency, commercial projects requiring superior insulation, and buildings located in high-wind or high-rainfall zones. The combination of aluminium resilience, thermal control, and professional-grade sealing makes it the choice for entryways that unite contemporary aesthetics with uncompromised technical performance.

The L437 achieves Ud = 0.85 W/m²K (ift Rosenheim certified), top-tier performance for aluminum exterior doors. This exceptionally low value minimises heat loss during winter and condensation buildup, thanks to the 34 mm articulated thermal break and quadruple glazing (44.1 triplex / 5mm / 44.1 triplex). For an average household, the payback period through heating savings is typically 2–3 years.

The L437 features 3 mm aluminium profiles with articulated thermal break and 92 mm total system depth. The frame has 80 mm depth and the door leaf reaches 92 mm, ensuring exceptional rigidity and optimal load distribution. The quadruple glazing (44.1 triplex / 5mm / 44.1 triplex) is securely encapsulated, fully protecting the interior aluminium from direct weather exposure and guaranteeing decades of durability.

While specific RC classification details are not listed in the technical specs, the L437 is engineered with premium entrance principles: robust multi-point hardware, 92 mm structural thickness, and 3-level sealing with dedicated EPDM gaskets. For exact classification and anti-burglary certification, we recommend direct consultation with our showroom specialist — your main entrance security deserves a personalised assessment.

The L437 offers standard sizes up to 1100 × 2300 mm, with single-leaf configurations reaching 1200 × 2500 mm. Any custom sizing—different thicknesses, adapted heights, or special configurations—is realised on demand to match your masonry and building structure. Our showroom team measures and verifies tolerances on-site, ensuring perfect fit and preventing installation issues.

The L437 with 80 mm frame depth requires a standard masonry opening (87–95 mm) and anchors matching load distribution to the structure. Installation involves rigorous frame levelling, multi-point fixation, and exterior sealing with polyurethane mortar. Compatibility with old masonry (brick), concrete, or modern insulated blocks is verified on-site — we recommend a certified installer to assess wall condition and profile.

The L437's aluminium and quadruple glazing are highly resistant; annual drainage channel cleaning and EPDM gasket inspection are sufficient. Neutral detergent water (pH 5–8) works well for interior and threshold; exterior requires periodic gasket inspection and accumulated dirt removal. If you notice play or opening difficulty, hinge adjustments are straightforward with basic tools — annual preventive maintenance with a specialist ensures optimal function for 20+ years.