Aluminium exterior door L121 made to order

L121 aluminium exterior door featuring articulated thermal break and quadruple glazing for supreme energy efficiency. Certified Ud coefficient of 0.85 W/m²K and triple EPDM sealing ensure complete weather protection and year-round comfort.

The L121 positions itself as the reference standard in premium-class aluminium exterior construction, where Germanic engineering meets aesthetic restraint. Every element — from profile to sealing system — responds to a logic of maximum performance without visual excess. This model addresses owners of sophisticated residential projects and showrooms that accept nothing less than top-tier thermal insulation.

The extruded aluminium profile, with controlled thickness of 3 mm, delivers structural rigidity and lightweight performance simultaneously — a rare equation in access door design. The total system depth of 92 mm distributes strategically: 80 mm for frame and 92 mm for leaf, an architecture that receives an articulated thermal break of 34 mm. This break functions as a barrier to heat flow, physically blocked by separating the inner profile from the outer. Sealing is achieved through three oversized EPDM gaskets — positioned to intercept water and air infiltration on triple pathways, a protection that exceeds standard benchmarks.

The quadruple glazing (44.1 triplex / 5 mm Satinato / 44.1 triplex) represents a construction that surpasses current European requirements. This glazing combination, paired with the articulated thermal break, generates a thermal coefficient Ud of 0.85 W/m²K — a value certified by ift Rosenheim, the institution of reference for thermal testing. This performance places L121 in the passive house category and compatible with 2030 energy efficiency standards. The system accommodates generous sizing: up to 1200×2500 mm for single leaves, dual configurations supporting up to 1100×2300 mm.

The raw or anodised aluminium finish permits discreet integration into the façade's colour palette. The clean profile excludes visually overloaded details — a design choice reflecting constructive maturity. L121 does not announce itself; it works in silence, delivering supreme insulation without gesture.

Recommended for high-end residences, residential renovations with thermal performance focus and commercial projects where exterior access demands insulation without compromise. It pairs naturally with premium hardwood flooring and equivalent window systems, creating complete architectural coherence.

The Ud coefficient measures heat loss through the door — the lower the value, the better the insulation. An Ud of 0.85 W/m²K indicates premium thermal performance, certified by ift Rosenheim, translating to reduced energy consumption and consistent interior comfort. For an external door, this is among the highest performance ratings available, especially combined with the articulated profiles and quadruple glazing.

Articulated insulation of 34 mm is a thermal polymer strip that interrupts aluminium continuity, preventing thermal bridges that would cause heat loss. In the L121 profiles, this 34 mm strip is stratified between aluminium layers, creating an efficient barrier maintaining the temperature difference between inside and outside. This is the critical feature ensuring the 0.85 W/m²K Ud performance and added interior comfort.

Quadruple glazing consists of four panes: 44.1 triplex / 5mm Satinato / 44.1 Triplex, where 44.1 triplex is safety-laminated glass and Satinato provides privacy. The four-pane configuration creates multiple air chambers that regulate temperature and reduce external noise transmission. For an external door, this guarantees maximum thermal and acoustic insulation, plus break-resistance protection through the triplex stratification that keeps the glass cohesive.

Standard dimensions are maximum 1100×2300 mm, and for a single leaf custom orders can reach up to 1200×2500 mm. This flexibility allows adaptation to various masonry types and architectural proportions. When ordering a custom door, our specialist team ensures the profiles and pivot mechanisms (if applicable) are sized appropriately to maintain thermal performance and long-term functionality.

The L121 door is equipped with three EPDM gaskets creating a triple-point seal around the frame perimeter. EPDM is a durable elastomer material, weather-resistant, that compresses when the door closes and forms a watertight and acoustic barrier. The three-level sealing ensures additional protection in areas with strong winds and heavy rain, preventing water and cold air infiltration, and helps maintain the optimal Ud coefficient over time.

The L121 door is constructed from aluminium with 3 mm thickness in the outer profiles, with a total depth of 92 mm — this ensures structural rigidity and long-term durability. Aluminium is inherently corrosion-resistant, doesn't rust, and won't warp under exposure to water, intense sun, or extreme temperature swings. To maintain the premium appearance, only periodic cleaning with water and mild detergent is needed, without requiring additional painting or treatment.