Engineered for high-load residential villas, coastal installations, and high-performance commercial envelopes.
Delivering high-capacity production, certified structural compliance, and end-to-end B2B supply chain solutions.
Established in 2014, Grandex Door Solutions Co., Ltd. is a premier entry door and architectural fenestration manufacturer operating from a state-of-the-art 35,000 m² modern facility. Built upon 16 years of deep-seated industry expertise and 8 years of dedicated international export operations, Grandex generates an annual export volume exceeding USD 28 million. Grounded in robust OEM and ODM trade backgrounds, our high-performance thermal break aluminum casement windows, hurricane impact systems, and custom curtain-wall profile assemblies primarily serve high-tier commercial contractors, real estate developers, and building material distributors across North America, Western Europe, and Oceania.
Quality control is strictly operationalized across every phase of production. Supported by ISO 9001 certified internal testing protocols and third-party laboratory verifications (including NFRC, Florida Miami-Dade NOA, and Australian AS2047 standards), our 45-member Quality Assurance (QA) team monitors material grain structural integrity, anodizing thickness, powder coating adhesion, and dual-seal EPDM perimeter weather-tightness. Driven by an aggressive Research & Development division staffing 85 specialized engineers, Grandex commercialized over 120 certified architectural designs last year alone, giving global B2B clients an unprecedented edge in structural strength, acoustic dampening, energy code compliance, and sleek aesthetic design.
Fully automated CNC machining lines, precision cutting saws, and rigorous semi-finished inspection stages.
A comprehensive technical analysis of thermal envelope performance, hurricane impact resilience, and structural fenestration design.
Utilizing high-density Technoform polyamide (PA66GF25) thermal barriers to eliminate structural thermal bridging. Achieves U-factors as low as 0.22 BTU/h·ft²·°F in compliance with California Title 24 standards.
Reinforced 6063-T6 extruded aluminum framing paired with SentryGlas® (SGP) laminated interlayers. Certified under Florida Miami-Dade NOA protocols to withstand design wind pressures exceeding ±90 PSF.
Asymmetric double and triple glazed IGUs combined with multi-chamber EPDM weatherstripping gaskets, delivering Sound Transmission Class (STC) ratings up to 45 dB for urban and airport-adjacent environments.
Standard aluminum windows suffer from severe thermal conductivity (approx. 160 W/m·K). Grandex casement windows integrate 24mm to 34mm wide glass-fiber reinforced polyamide strips, reducing frame heat transfer to below 1.8 W/m²K. This structural separation prevents indoor condensation, mitigates HVAC loads by up to 38%, and guarantees dimensional stability across extreme ambient temperatures ranging from -30°C to +80°C.
Modern architectural trends demand ultra-slim sightlines without sacrificing structural stability or water resistance. Casement windows provide superior air-tightness compared to traditional sliding variants due to their compression-seal operation mechanism. When the casement sash locks against the multi-point hardware keep, continuous EPDM bubble seals compress uniformly across the perimeter, achieving zero air infiltration at 6.24 psf pressure differentials.
Furthermore, Grandex offers bespoke architectural hardware configurations—including concealed friction hinges, heavy-duty stainless steel 304 multi-point locks, and motorized chain actuators compatible with smart building management systems (BMS).
Next-generation engineering in vacuum insulating glass, carbon-neutral aluminum processing, and smart automated fenestration.
Procuring commercial aluminum casement windows requires strict adherence to localized structural and environmental codes. Grandex maintains direct certification pathways to streamline cross-border project approvals:
From custom profile extrusions to certified site installation engineering support.
Grandex eliminates international procurement friction through comprehensive, end-to-end B2B partner support services. Recognizing that architectural window specifications vary drastically across climate zones and regional building codes, our engineering team acts as an extended technical arm for your organization.
In-house CAD/CAM toolmakers create proprietary extrusion profiles within 14 business days, accommodating custom wall thicknesses (1.4mm to 3.0mm) and unique architectural mullion attachments.
Choose from AkzoNobel Interpon powder coatings, PVDF fluorocarbon coatings for aggressive coastal atmospheres (C5 corrosion rating), or hard-anodized matte finishes with 25-year anti-fading warranties.
Heavy-duty steel-crate packaging, moisture-barrier wrapping, and 3D container space optimization reduce freight damage to 0.01% while maximizing freight volume efficiency.
Explore our certified range of thermal break doors, awning windows, fixed combos, and Title 24 compliant configurations.
Essential guidance for commercial contractors, architectural specifiers, and wholesale distributors.
Grandex Door