Explore our certified structural aluminum entry, casement, and sliding systems engineered for hurricane zones, low-E efficiency, and architectural luxury.
Established in 2014, Grandex Door Solutions Co., Ltd. is a premier entry door manufacturer operating from a modern 35,000 m² state-of-the-art facility. With 16 years of core industry expertise and 8 years of dedicated global export experience, the enterprise generates an annual export revenue of USD 28 million. Grounded in strong OEM and ODM trade backgrounds, our high-performance architectural systems primarily serve top-tier markets across North America and Western Europe, supported by a robust global network of over 1,200 supply chain partners. We directly cater to leading building material distributors, real estate developers, and commercial contractors seeking industrial-grade thermal insulation, hurricane resistance, and modern aesthetics.
Quality is integral to our operations: supported by strict ISO 9001 certified internal testing procedures and third-party laboratory verification, our 45-member Quality Assurance (QA) team ensures rigorous quality control throughout every step of production. Driven by an active Research & Development division with 85 specialized engineers, we introduced 120 new door and window structural designs last year alone. We offer fully customized commercial solutions spanning custom extrusions, smart security locks, fluorocarbon surface finishes, and insulated decorative glass assemblies.
A comprehensive analysis of structural aluminum alloy grades, polyamide thermal barriers, and spectroradiometric glazing performance.
We utilize precision-extruded 6063-T6 architectural grade aluminum profiles for residential front doors and high-strength 6061-T6 structural alloys for commercial entry systems. Profiles feature profile wall thicknesses exceeding 2.0mm to 3.0mm, delivering superior tensile strength (up to 240 MPa) and exceptional resistance to physical deflection under high wind loads.
To eliminate thermal bridging, Grandex integrates 24mm to 34mm multi-chamber Polyamide 66 reinforced with 25% Glass Fiber (PA66-GF25) structural insulation strips. This reduces profile thermal conductivity to achieve overall system U-factors as low as 0.18 to 0.24 BTU/h·ft²·°F (1.0 to 1.3 W/m²K).
Engineered with triple-seal EPDM gaskets and multi-point German hardware locking mechanisms (HOPO / Siegenia / GU), our entrance assemblies provide acoustic dampening ratings up to STC 45 dB and structural design wind pressure resistance exceeding DP100 (Design Pressure 100 PSF).
| Performance Parameter | Grandex Standard Series | Grandex Thermal-Break Extreme | Test Standard / Regulatory Compliance |
|---|---|---|---|
| Thermal Transmittance (U-Factor) | 0.32 BTU/h·ft²·°F (1.8 W/m²K) | 0.18 - 0.22 BTU/h·ft²·°F (1.0 - 1.2 W/m²K) | NFRC 100 / ISO 10077-2 |
| Structural Wind Load Resistance | DP 50 (2400 Pa) | DP 100 (4800 Pa / High-Velocity Hurricane Zone) | ASTM E330 / AAMA 101 / TAS 202 |
| Sound Transmission Class (STC) | STC 35 dB | STC 42 - 46 dB (Triple Glazed Double Laminated) | ASTM E90 / ASTM E413 |
| Air Infiltration Rate | < 0.1 cfm/ft² | < 0.02 cfm/ft² (A3 Airtightness Grade) | ASTM E283 / EN 12207 Class 4 |
| Surface Finish Coating | Qualicoat Powder Coating | Kynar 500 PVDF (70% Fluorocarbon Coating) | AAMA 2605 / ISO 2810 |
Our 35,000 m² smart factory utilizes digitized MES systems and multi-axis CNC automation to ensure sub-millimeter tolerances across all customized batch runs.
Raw materials
Sawing
Milling
CNC Milling
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CNC Center
Cutting
Intelligent Sorting
Checking and Packing
Sawing Machine
Milling Machine
CNC Milling Machine
CNC Drilling Machine
CNC Center Machine
Double Head Cutting Saw
Intelligent Sorting Line
Semi-finished inspection
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Tailored structural configurations designed to meet stringent microclimate requirements and international building codes.
Engineered for coastal regions subject to severe tropical storms (e.g., Florida HVHZ, Caribbean coastline). Incorporates PVB/SGP laminated impact glass (9/16" to 1-1/16" thick) and heavy-duty structural corner brackets, satisfying Florida NOA (Notice of Acceptance) and TAS 201/202/203 testing standards.
Designed for cold North American and Northern European climates where stringent insulation is required. Combines triple-pane Argon-filled Low-E glass units, warm-edge spacers, and multi-chamber thermal breaks to comply with California Title 24 Energy Code and European Passivhaus certifications.
Heavy-duty pivot door and automatic entry systems built to withstand high cycle frequencies. Features concealed overhead door closers, electromagnetic lock integration, continuous stainless steel hinges, and ADA-compliant low-profile threshold saddles.
From architectural CAD detailing to factory acceptance testing (FAT) and sea-freight container packing.
Our 85 R&D engineers review client floor plans, structural wind load specifications, and local code requirements. We issue complete Auto-CAD shop drawings, 3D Revit BIM models, and structural calculation reports prior to tooling and profile extrusion.
Every lot of 6063/6061 billet aluminum undergoes optical emission spectrometry to verify elemental alloy breakdown (Magnesium, Silicon, Iron limits). Raw glass sheets undergo spectroradiometric analysis to guarantee Low-E coating emissivity tolerances.
Extrusions move through automated double-head cutting saws and 5-axis CNC machining centers. Milling for multi-point lock bodies, hinge pockets, and drainage weep holes occurs with sub-0.1mm repeatability.
Our dedicated 45-member Quality Assurance team carries out multi-stage checks: dry film thickness (DFT) gauge tests on Kynar coatings, corner crimping pull-off torque testing, air-water-structural mock-up testing in our internal pressure chamber, and final visual surface auditing.
Finished door units are wrapped in protective polyethylene anti-scratch films, edged with heavy-duty foam corner guards, and vacuum-sealed inside fully enclosed fumigated plywood crates. We provide CIF, FOB, and DDP (Delivered Duty Paid) shipping to major ports in North America, Western Europe, and Australia.
Guaranteed compliance for high-end residential and commercial building approval worldwide.
Fully tested under NFRC (National Fenestration Rating Council), AAMA/WDMA/CSA 101/I.S.2/A440, Florida Building Code (HVHZ / NOA Certification), and California Title 24 Energy Efficiency Standards.
CE Marked according to EN 14351-1:2006+A2:2016 for external pedestrian doorsets. Factory processes are audited under ISO 9001 Quality Management Systems and Qualicoat surface finishing standards.
All structural aluminum profiles carry a 10-Year Limited Warranty; Kynar 500 surface finishes are guaranteed against chalking and fading for up to 20 years. Dedicated engineering technical support available for job site troubleshooting.
Pioneering smart entrance capabilities and ultra-low carbon sustainable aluminum manufacturing.
Seamless embedding of Ultra-Wideband (UWB) hands-free proximity sensors, 3D facial recognition modules, motorized multi-point locks, and home automation control protocols (Zigbee / Matter / KNX).
Next-level energy performance through dynamic tinting smart glass that adjusts light transmission based on solar radiation, combined with ultra-thin Vacuum Insulated Glass achieving U-factors below 0.10 BTU/h·ft²·°F.
Transitioning primary extrusion stocks toward hydroelectric-smelted low-carbon aluminum and post-consumer recycled alloys, reducing embodied carbon dioxide emissions down to < 4.0 kg CO2e per kg of extruded profile.
Explore additional high-performance architectural fenestration and door products available for bulk ordering.
Key information regarding ordering, customization standards, shipping logistics, and performance testing.
Our standard Minimum Order Quantity (MOQ) for custom OEM/ODM architectural front doors is 10 units for commercial projects or distributor mixed-container orders. For standard catalog profiles, flexible sample batch quantities can be negotiated based on project specifications.
Our hurricane-rated entrance systems are constructed using heavy-duty 6061-T6 aluminum alloys, reinforced corner keys, and SentryGlas® (SGP) or PVB laminated impact glass. They undergo rigorous TAS 201 (Large Missile Impact Test), TAS 202 (Uniform Static Air Pressure Test), and TAS 203 (Cyclic Wind Pressure Loading Test) to achieve official Florida Notice of Acceptance (NOA) compliance for High-Velocity Hurricane Zones (HVHZ).
For aggressive coastal or marine environments, we recommend our PPG Kynar 500® or Hylar 5000® 70% Fluorocarbon PVDF coating, certified to AAMA 2605 standards. This system provides superior resistance against salt spray corrosion, chalking, and UV degradation for up to 20 years. Anodized finishes (up to 25 microns) are also available.
Standard manufacturing lead times range from 25 to 35 business days following shop drawing sign-off and deposit receipt. For complex custom extrusions requiring new die tooling, allow an additional 10 to 15 days for die creation and sample extrusion validation.
Yes. Supported by our 85-member R&D team, we offer full customization of unit dimensions up to oversized entry pivots (heights exceeding 3.5 meters). We routinely integrate smart electronic mortise locks, biometric keypad handles, concealed hydraulic closers, and multi-point panic hardware from major brands including Yale, Schlage, Dormakaba, and GU.
Grandex Door