Explore our top-tier precision systems engineered to withstand structural wind loads, extreme climatic weathering, and stringent energy efficiency mandates across North America, Europe, and Oceania.
Bridging high-end architectural vision with automated CNC machining, certified structural durability, and streamlined global export logistics.
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.
High-rise building envelopes and coastal residential zones require oversized portal structures engineered to withstand cyclic design pressures exceeding 100 PSF (+/- 4800 Pa). We integrate 6063-T6 architectural grade structural aluminum profiles with internal steel chamber reinforcement to eliminate torsional deflection under extreme aerodynamic shear.
Large-aperture entrance portals inherently risk severe thermal transference. Our patented multi-cavity polyamide (PA66 GF25) thermal break barriers, coupled with argon-filled low-emissivity double and triple insulated glass units (IGUs), deliver U-values as low as 0.22 BTU/(hr·ft²·°F), satisfying rigorous IECC and Passive House standards worldwide.
Handling monumental pivot door panels up to 800 kg requires aerospace-level hardware integration. Our in-house R&D engineers design floor springs with hydraulic soft-close damping, dynamic perimeter weatherstripping with magnetic multi-point gasket drops, and automated biometric access controls built directly into extruded profiles.
Our smart plant in Foshan operates synchronized CNC machining centers, automated cutting saws, and laser-guided QA sorting hubs, guaranteeing structural tolerances within ±0.3mm across all oversized fenestration frames.
Procuring large entrance doors for foreign building jurisdictions mandates verifiable performance data. Our door assemblies hold certifications validated by independent internationally accredited test laboratories.
Engineered for High-Velocity Hurricane Zones (HVHZ). Subjected to large missile impact tests (TAS 201) with 9-pound 2x4 lumber shot at 50 ft/s, followed by 9,000 cyclic wind pressure pulses (TAS 203) without structural seal breakdown or glass disengagement.
Verified through simulation and physical chamber testing in accordance with NFRC 100/200/400. Accurately determines overall U-factor, Solar Heat Gain Coefficient (SHGC), and Visible Transmittance (VT) to guarantee commercial LEED certification credits.
Full conformance with Australia’s National Construction Code (NCC) for structural deflection (AS4420.2), air infiltration (AS4420.4), and water penetration resistance (AS4420.5) under extreme cyclone wind conditions rated up to Ultimate Wind Loads of 4500 Pa.
Certified to mandatory CE directives regulating dangerous substances, air permeability Class 4, water tightness Class 9A, and wind resistance Class C5. Ready for straightforward customs clearance and immediate installation throughout the EU and UK (UKCA mark).
Before any container departs our facility, full-scale production mockups of custom large entrance portals undergo continuous differential pressure chambers up to 6000 Pa, simulating typhoons and extreme barometric swings. Water nozzles spray 200 liters/hour per square meter across continuous 15-minute cycles to verify that silicone corner vulcanization and internal drainage paths remain completely hermetic.
Different geographic regions demand unique engineering formulations. We customize extrusion alloy temper, glass build-ups, and locking systems to address local contextual challenges.
High salinity and relentless seasonal tropical storms require our marine-grade AkzoNobel or PPG Duranar powder coatings (AAMA 2605 compliant) offering 30-year resistance against chalking and salt-spray corrosion. Door frames are reinforced with 12mm SentryGlas (SGP) laminated interlayers that prevent structural envelope breach even if outer glass plies sustain catastrophic flying debris impact.
Extreme daytime temperature swings cause severe thermal bowing in massive entry doors. We counteract this using dual-compound expansion thermal barriers that allow independent micro-expansion of exterior and interior aluminum faces without warp. Low-E coatings with a selective SHGC of 0.23 reflect 77% of infrared solar heat while maintaining crystal-clear interior illumination.
Condensation and frost bridging can compromise perimeter hardware. Our cold-climate doors feature 34mm wide technoform polyamide struts combined with polyurethane aerogel core fills. Triple-glazed units with warm-edge Swiss spacers ensure interior glass face temperatures remain comfortable above dew point, completely eliminating condensation and interior frame icing.
Continuous operating duty calls for self-lubricating heavy-duty needle bearing pivot hinges, concealed electric latch retractors, and seamless integration with building automation protocols (BACnet, Crestron, Control4). The entrances achieve Grade 4 cycle testing (over 1,000,000 cycles) without panel drop or pivot play.
As architectural apertures expand to heights exceeding 6 meters, fenestration engineering is pivoting toward active material science, carbon-neutral manufacturing, and intelligent kinetic systems.
To meet international ESG carbon audits, we are transitioning to low-carbon primary billets smelted using renewable hydroelectric energy (generating under 4.0 kg CO2 per kg aluminum). This guarantees European developers full BREEAM and DGNB credit alignment without compromising 6063 structural tensile integrity.
Our R&D lab is testing fully concealed power transfer hinges that conduit low-voltage wiring directly to dynamic smart glass panels. Property owners dynamically shift glass tint from 60% VLT down to 1% privacy tint within 90 seconds via voice commands or algorithmic solar sensors, reducing HVAC cooling loads by 28%.
By laminating ultra-high modulus carbon fiber inside the internal web of oversized pivot door stiles, we decrease profile sightlines from the traditional 120mm down to a minimalist 45mm, while boosting resistance to deflection under wind load by over 300% compared to pure aluminum alloys.
Direct answers to core engineering, shipping, and compliance queries raised by structural engineers, commercial contractors, and fenestration import distributors.
We regularly manufacture oversized pivot door leafs reaching up to 3000mm (10 ft) in width and 6000mm (20 ft) in clear opening height. These monolithic leaves utilize internal high-tensile tie-rod tensioners that permit site micro-adjustments against thermal deflections, mounted upon German-engineered hydraulic pivots certified for 1,000 kg operational capacity.
Our products are tested via accredited testing bodies (including Intertek and Fenestration and Glazing Industry Alliance labs) according to ASTM E1886, ASTM E1996, and TAS 201/202/203. We provide our global builder clients with full laboratory test reports, Florida Product Approvals (FL#) or Miami-Dade Notices of Acceptance (NOA) for seamless local municipal permitting.
For severe marine environments located within 500 meters of the coastline, we execute a multi-stage zirconium pre-treatment followed by Qualicoat Class 3 or AAMA 2605 certified fluoropolymer PVDF coatings. This process delivers 10,000 hours of neutral salt spray testing resistance, providing an anti-fading, non-corroding performance warranty up to 25 years.
Every oversized door leaf and frame assembly is sealed in moisture-barrier film, protected with rigid cellular corner guards, and enclosed in fully closed fumigated ISPM-15 plywood crates with internal high-density EVA shock-dampening cradles. Crates are loaded with custom heavy-duty spreader bars and secured into 40ft HQ or Open Top containers with steel chocking to avoid transit shifts.
From curved hurricane fixed glass screens to pivot entrance monoliths and overhead insulated glass garage systems, review our full line of export-ready configurations.
Grandex Door