Explore our certified export series engineered for extreme weather resilience, structural wind load performance, and high solar heat loss prevention across North American and Western European climate zones.
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.
In high-performance building envelopes, the entrance door serves as both an aesthetic focal point and a critical barrier against heat transfer. Standard float glass exhibits an emissivity coefficient ($\epsilon$) of approximately 0.84, allowing significant far-infrared radiation (heat energy) to pass through unhindered. By applying ultra-thin, microscopic metallic oxide layers—typically silver ($Ag$) nano-coatings bounded by dielectrics—our Low-E Front Glass Systems reduce the surface emissivity down to 0.02 to 0.05.
Engineered spectrally selective Low-E coatings block unwanted solar infrared wavelengths (780–2500 nm) while maximizing visible light transmission (VLT). This minimizes air conditioning loads in tropical and southern US zones (Title 24 / NFRC standards).
Combined with 90%+ Argon or Krypton gas fills inside hermetically sealed Insulated Glass Units (IGU) and warm-edge spacer technology, our front doors achieve U-factors as low as 0.18 BTU/h·ft²·°F (1.0 W/m²K), perfect for passive house projects.
Our multi-layer Low-E formulations filter over 95% of destructive ultraviolet rays (280–380 nm), protecting interior flooring, artwork, and interior wood finishes from premature bleaching and structural degradation.
| Glazing Specification Structure | Visible Light (VLT %) | SHGC Rating | U-Factor (US Standard) | Sound Attenuation (STC) |
|---|---|---|---|---|
| Single Pane Clear Glass (Baseline Control) | 88% | 0.82 | 1.04 | 26 dB |
| Double Insulated Glass (Clear + Clear) | 78% | 0.70 | 0.48 | 31 dB |
| Double Insulated Single Low-E + Argon Gas | 70% | 0.38 | 0.26 | 35 dB |
| Triple Glazed Dual Low-E + Argon (Passive House Ready) | 62% | 0.24 | 0.17 | 42 dB |
| Hurricane Impact Laminated Double Low-E (Miami-Dade NOA) | 65% | 0.28 | 0.22 | 45 dB |
To maintain tolerance precision within ±0.1mm across high-volume production, Grandex utilizes automated multi-axis CNC milling, intelligent sorting systems, and double-head cutting saws. Every batch undergoes rigorous quality assurance monitored by our 45-member QA team certified under ISO 9001 frameworks.
As building codes shift toward net-zero targets (such as Title 24 in California and the Energy Performance of Buildings Directive in the EU), enterprise buyers require specialized fenestration tailored to geographical hazards and architectural codes.
Designed specifically for coastal regions subject to severe weather events like hurricanes. Utilizing SGP (SentryGlas® Plus) interlayer laminated Low-E glass, our systems pass Miami-Dade NOA and Florida Building Code (FBC) large missile impact tests up to Design Pressure (DP) +70/-70 PSF.
Providing high acoustic insulation (STC 40+) and heavy-duty traffic resilience. Engineered multi-point lock systems integrated with thermal break extruded aluminum profiles offer enhanced security alongside low maintenance operational life cycles.
Ultra-slim sightlines combined with massive panel dimensions. Our panoramic sliding and accordion bifold doors feature continuous thermal breaks and double soft-coat silver Low-E panels for maximal indoor-outdoor transition aesthetic without sacrificing thermal efficiency.
Navigating foreign trade compliance requires verified laboratory documentation. Grandex supplies ready-to-file test reports directly to commercial contractors, architects, and importers across North America, Australasia, and Europe.
| Target Export Market | Mandatory & Recommended Certifications | Grandex Compliance Support & Verification |
|---|---|---|
| United States (National) | NFRC (National Fenestration Rating Council), AAMA | Certified U-Factor, SHGC, and VT thermal ratings for Energy Star compliance. |
| Florida / Coastal US | Miami-Dade NOA, Florida Product Approval (FBC) | Cyclic wind pressure and structural missile impact blast protection verified. |
| California (US) | California Title 24 Energy Code | Strict solar heat gain coefficient (SHGC $\le$ 0.23) compliant glazing profiles. |
| Australia / New Zealand | AS2047, AS1288, WERS (Window Energy Rating Scheme) | Structural deflection, air infiltration, and water resistance test reports available. |
| European Union | CE Marking, EN 14351-1, EN 1279 (IGU Quality) | Thermal transmission calculations, safety glass toughening certificates (EN 12150). |
Under the direction of our 85-member R&D division, Grandex is expanding beyond passive solar control into dynamic smart fenestration technologies. Our technical engineering roadmap prioritizes three core developments:
Replacing traditional argon gas chambers with a 0.2mm high-vacuum gap, achieving ultra-thin door profiles with center-of-glass U-factors below 0.08 BTU/h·ft²·°F (0.45 W/m²K), matching solid insulated wall thermal resistance.
Incorporating low-voltage micro-current coatings that actively change light transmission and SHGC based on real-time solar intensity signals or smart home IoT controllers.
Advancing multi-cavity PA66 GF25 thermal break strips with integrated aerogel insulation inserts to eliminate thermal bridging around heavy aluminum entry door perimeter frames.
Select from our certified series of sliding doors, single hung windows, interior French doors, and specialized impact fenestration systems manufactured for export.
Get definitive answers regarding order customization, compliance documentation, shipment logistics, and engineering specifications for Low-E architectural door systems.
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