Explore our premium architectural doors and windows engineered for extreme durability, energy conservation, and high structural loads.
Grandex Door Solutions Co., Ltd. combines advanced thermal engineering with high-capacity smart manufacturing to power world-class building projects.
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.
Architectural entry doors are no longer passive entry points; they are complex dynamic thermal envelopes designed for net-zero carbon building performance.
Our Insulated Glass Units (IGU) incorporate double-tempered low-emissivity (Low-E) glass paired with 90%+ pure Argon gas filling. Warm-edge structural polymer spacers reduce peripheral thermal bridging, achieving U-factors below 0.24 BTU/h·ft²·°F.
Utilizing 25% glass-fiber reinforced Polyamide (PA66GF25) thermal struts, our extruded 6063-T6 aluminum profiles decouple external temperature extremes from interior living spaces, eliminating interior condensation under ambient humidity delta.
Future-proofed with motorized multi-point locking mechanisms compatible with biometric access control, Zigbee/Z-Wave automation networks, and concealed heavy-duty 3D adjustable pivot hardware capable of supporting door leaves up to 400 kg.
| Performance Indicator | Grandex Standard Spec | High-Performance Option | Test Standard / Certification |
|---|---|---|---|
| Thermal Transmittance (U-Value) | 1.4 - 1.8 W/m²K (0.25 - 0.31 Btu/h·ft²·°F) | ≤ 0.8 W/m²K (Passivhaus Standard) | NFRC 100 / EN ISO 10077-1 |
| Acoustic Insulation (STC / Rw) | STC 38 dB | STC 45+ dB (Triple Glazed DB laminated) | ASTM E90 / ISO 140-3 |
| Wind Pressure Resistance (DP) | DP 50 (2400 Pa) | DP 90+ (4320 Pa - Hurricane Impact) | AAMA/WDMA/CSA 101/I.S.2/A440 |
| Air Infiltration / Water Tightness | < 0.1 cfm/ft² @ 6.24 psf (300 Pa) | Zero leakage @ 15 psf (720 Pa) | ASTM E283 / ASTM E331 |
Customized engineering configurations tuned precisely to regional building codes, climate zones, and commercial construction requirements.
Fully compliant with NFRC energy rating standards and Florida Miami-Dade High-Velocity Hurricane Zone (HVHZ) requirements. Our impact-resistant aluminum entry doors feature SentryGlas® interlayers that resist missile impact and sustained cyclical wind pressures up to 90 DP.
Engineered specifically for the Australian and New Zealand harsh UV exposure and coastal wind conditions. Tested under AS2047 structural requirements, AS1288 glass glazing standards, and verified under WERS for residential and commercial thermal performance.
Adhering to strict EU EN 14351-1 building product directives. Featuring warm-edge spacer technology, triple silicone weather-stripping seals, and deep multi-cavity thermal break profiles engineered to meet Passivhaus energy efficiency demands.
Inside our 35,000 m² modern digital fabrication center: 18 structured manufacturing processes driving high precision, zero defect tolerance, and rapid turnaround.
A streamlined, risk-managed path from engineering schematics to global site delivery for large-scale development projects.
Our 85-engineer R&D team reviews architectural shop drawings, providing Design for Manufacturability (DFM) feedback, structural load calculations, thermal simulation modeling, and custom extrusion profile design within 48 hours.
Rapid physical sample assembly followed by in-house structural air/water/wind pressure testing. Optional third-party lab testing (Intertek, CSA, UL) for project-specific compliance certification before full-scale manufacturing batch release.
CNC automated cutting, drilling, corner-crimping, and IGU seal integration. Supervised by our 45-member QA team implementing strict ISO 9001 internal checkpoints at key production nodes to eliminate dimensional variances.
Custom wooden crating with foam corner guards, vacuum plastic wrapping, and steel strap reinforcements ensuring zero glass breakage during transoceanic shipping. Full support for DDP, FOB, and CIF delivery terms.
Direct technical answers addressing engineering metrics, customization capabilities, minimum order quantities, and international certification protocols.
Explore additional high-performance architectural systems engineered for commercial, luxury residential, and hospitality applications.
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