Engineered to exceed EN 14351-1 standards with superior thermal transmittance (U-Factor), structural deflection resistance, and customizable glazing assemblies.
In modern architectural design, fenestration systems are no longer viewed merely as passive building envelopes, but as active climate-control barriers. Traditional aluminum profiles, while prized for their structural integrity, low weight, and corrosion resistance, suffer from high thermal conductivity ($k \approx 160-200 \text{ W/m}\cdot\text{K}$). Left unmitigated, uninterrupted aluminum frames act as thermal bridges, transferring conductive heat into interior spaces during summer and radiating building heat outward in winter.
As a leading CE Certified Thermal Break Aluminum Door Manufacturer & Supplier, Grandex Door Solutions Co., Ltd. resolves this fundamental physical limitation through structural thermal isolation technology. By inserting a low-conductive structural polyamide barrier—specifically Polyamide PA66 reinforced with 25% Glass Fiber (PA66 GF25)—between the inner and outer aluminum extrusions, the thermal bridge is broken. This continuous thermal break reduces profile thermal transmittance ($U_f$) down to levels below $1.4 \text{ W/m}^2\cdot\text{K}$, enabling full compliance with stringent international building energy codes, such as the European Union's Energy Performance of Buildings Directive (EPBD) and North America's ASHRAE 90.1 standards.
Standard un-insulated aluminum frame doors typically exhibit U-factors ranging between $5.0$ and $7.0 \text{ W/m}^2\cdot\text{K}$. Grandex's multi-cavity PA66 thermal break doors, combined with Low-E argon-filled double or triple glazing, drop the overall system U-factor ($U_w$) to as low as $0.8 - 1.2 \text{ W/m}^2\cdot\text{K}$, yielding up to a 75% decrease in conductive heat loss across the building envelope.
16 years of industry expertise powering international commercial and residential developments.
Established in 2014, Grandex Door Solutions Co., Ltd. is a premier entry door manufacturer operating from a modern 35,000 m² facility. With 16 years of industry expertise and 8 years of dedicated export experience, the company generates an annual export revenue of USD 28 million. Grounded in strong OEM and ODM trade backgrounds, our products primarily serve North America and Western Europe, supported by a network of over 1,200 supply chain partners. We cater to leading building material distributors, real estate developers, and commercial contractors. Quality is integral to our operations: supported by strict ISO 9001 certified internal testing and third-party laboratory verification, our 45-member QA team ensures rigorous quality control throughout production. Driven by an active R&D division with 85 specialized engineers, we introduced 120 new door designs last year and offer full custom solutions spanning custom dimensions, security locks, surface finishes, and decorative glass panels.
Automated precision engineering ensuring tight dimensional tolerances, structural integrity, and flawless finish consistency.
Pioneering the next generation of smart, eco-efficient structural door and window systems.
Grandex's forward-looking R&D focuses on incorporating 0.3mm vacuum-gap insulating glass units with PA66 multi-cavity thermal breaks, pushing envelope thermal resistance toward passive house standards ($U_w \le 0.6 \text{ W/m}^2\cdot\text{K}$).
By injecting hydrophobic silica aerogel into internal thermal break chambers, conductive air convection inside profile cavities is eliminated, achieving optimal thermal isolation without increasing profile depth.
In response to global decarbonization, our material roadmap prioritizes post-consumer recycled aluminum extruded under green hydro-powered energy, drastically decreasing embodied carbon footprints for LEED v4 projects.
Tailored structural fenestration systems formulated for extreme environments and stringent building codes.
Specially engineered with thick-walled 6063-T6 aluminum profiles, high-load stainless steel multi-point locking systems, and heavy-duty laminated impact glass. Engineered to satisfy Florida Building Code (FBC) and High-Velocity Hurricane Zone (HVHZ) requirements, resisting wind pressures exceeding 90 psf.
Combining narrow-sightline aesthetics with heavy-duty structural deflection ratings. Designed to integrate smooth sliding mechanisms, high acoustic damping (STC rating up to 45 dB), and air/water infiltration resistance certified to ASTM E283, E331, and E547 standards.
Engineered with multi-chamber thermal struts, warm-edge spacers, and triple-pane low-E glass filled with 90%+ pure argon gas. Prevents internal frame condensation, frost formation, and thermal expansion fatigue even under winter differentials of $\Delta T > 45^\circ\text{C}$.
Rigorous third-party lab verification for total global market compliance.
| Standard / Certification | Target Market | Key Performance Indicators | Grandex Compliance Status |
|---|---|---|---|
| CE Marking (EN 14351-1) | European Union / EFTA | Air Permeability (EN 12207), Watertightness (EN 12208), U-Factor | Fully Certified & Laboratory Verified |
| NFRC (100 / 200 / 400) | North America (USA / Canada) | Thermal Transmittance (U-Factor), SHGC, Visible Transmittance (VT) | NFRC Listed & Labeled |
| Miami-Dade NOA / FPA | Florida / Caribbean / HVHZ | Large Missile Impact (TAS 201/202/203), Cyclic Wind Load | NOA Approved Assemblies Available |
| AAMA / WDMA / CSA 101 / I.S.2 / A440 | North America | Design Pressure (DP), Structural Load (ASTM E330), Water Entry | CW & AW Class Performance Ratings |
| AS2047 / AS1288 | Australia / New Zealand | Deflection Testing, Air Infiltration, Operating Force, Glass Safety | AS2047 Certified Systems |
Streamlined supply chain solutions designed for high-volume commercial purchasers, real estate developers, and OEMs.
Our engineering team provides comprehensive DWG/BIM drawings within 48 hours, enabling architects and project engineers to seamlessly integrate exact frame profiles, structural attachments, and glass specifications into building blueprints.
Utilizing 3D stacking algorithms and heavy-duty steel-reinforced wood crates, we maximize container volume utilization by up to 18% while guaranteeing zero transit damage across transoceanic shipping routes.
Every profile extrusion, thermal strip batch, glass unit, and hardware component carries an internal QR barcode allowing full supply chain traceability from raw ingot casting to final factory departure.
In-depth responses to critical procurement, technical, and regulatory questions.
Explore our extended series of hurricane-impact, ultra-slim panoramic, and soundproof custom window and door solutions.
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