Aluminium exterior door L721 made to order

L721 aluminium exterior door with quadruple glazing and thermal performance 0.85 W/m²K. Greek-engineered 92 mm profile for contemporary homes with bespoke sizing up to 2500 mm.

The L721 exterior door positions itself within premium aluminium door engineering, conceived for contemporary residences prioritising energy efficiency and restrained constructional language. Greek-manufactured Thiral profiles command recognition across European markets for their synthesis of technical innovation and visual parsimony—L721 embodies this philosophy. The collection addresses principal entries requiring superior insulation and flexible aperture solutions, from urban apartments to dwellings exposed to variable temperate climates.

Constructional architecture combines 3 mm laminated aluminium with an articulated thermal break of 34 mm, delivering efficient separation between external and internal profiles. The quadruple glazing system—44.1 mm outer triplex, 5 mm satin glass, 44.1 mm inner triplex—forms a compact 92 mm barrier obstructing both thermal radiation and acoustic disturbance. Triple EPDM gaskets guarantee airtightness across the door's operational lifetime, whilst the 80 mm frame depth permits straightforward installation into standard brick and concrete reveals, dispensing with complex structural preparation.

Thermal performance certified by ift Rosenheim at 0.85 W/m²K positions L721 among superior-insulation doors, delivering measurable reduction in energy loss at the principal dwelling access. The accumulated mass of glazing and leaf—92 mm total—attenuates traffic noise and external environmental disturbance. The triple-compression EPDM system maintains seal integrity under extreme climatic stress, ensuring reliable operation across consecutive decades of service.

Dimensional flexibility accommodates standard apertures of 1100×2300 mm (single-leaf) and twin-leaf variants reaching 1200×2500 mm per leaf, offering freedom for generously proportioned entries. The door is available in side-hung and pivot configurations with option for automatic closure systems or reduced thresholds. Aluminium finishes may be coordinated with façade RAL palettes or retained in natural silver anodising.

Recommended application: principal entries of detached houses and residential blocks positioned to prevailing wind and solar exposure. L721 integrates seamlessly within minimalist, Scandinavian, and contemporary architectural idioms where thermal performance and longevity constitute functional and aesthetic values. Pairing with premium interior flooring reinforces perception of superior-quality residential investment.

The Ud coefficient of 0.85 W/m²K (certified by ift Rosenheim) places the L721 in the category of external doors with very good thermal performance, cutting heat loss by half compared to standard aluminium doors. It achieves this through 34 mm insulation with articulated thermal break and quadruple glazing (44.1 triplex / 5mm satin / 44.1 triplex), with direct visible impact on interior comfort and energy consumption during cold seasons.

Yes, the L721 accommodates customisation up to 1200×2500 mm on a single leaf, significantly exceeding conventional standard dimensions of 1100×2300 mm. This allows integration into contemporary projects with generous openings without compromising structural rigidity or sealing integrity. Consult our design team for custom solutions tailored to your specific architectural constraints.

The L721 glazing is composed of 44.1 triplex / 5 mm satin / 44.1 triplex — four panes total, with two laminated triplex glass sheets and a central satin space. Compared to triple glazing (three panes), the quadruple composition offers significantly improved thermal and acoustic insulation, plus enhanced impact protection. The interior satin layer ensures discreet light filtering without affecting energy performance.

The L721 uses three multi-point EPDM gaskets arranged across the aluminium frame, ensuring uniform sealing around the entire perimeter. EPDM gaskets (synthetic elastomers) are UV-resistant and withstand extreme temperature fluctuations, remaining effective for 15-20 years under normal exposure conditions. An annual rinse with mild water and soap, followed by neutral silicone application on contact areas, extends functional life and prevents draft issues.

The L721 requires a masonry opening sized precisely to the ordered dimensions (tolerance ±10 mm) and a flat, level surface for correct installation. The system depth of 92 mm (80 mm frame + 92 mm leaf) is compatible with standard frames in concrete, brick or exposed masonry, with easy adaptation for thick-wall construction. For secure installation, mechanical anchoring and polyurethane sealing of perimeter gaps are recommended — external moisture, brick type and mortar composition are critical factors for final thermal performance.

The L721 has an aluminium thickness of 3 mm combined with a 34 mm articulated thermal break, achieving optimal balance between lightness and structural resistance. This configuration ensures excellent rigidity without thermal deformation, even at maximum dimensions of 1200×2500 mm, and durability of at least 25-30 years in mixed climates. Aluminium, being weather-resistant and not subject to biological degradation, requires no periodic repainting and resists marine corrosion or urban pollution.