Precision Fenestration Portfolio
High-Performance Bi-Fold, Sliding & Specialty Door Systems
Engineered to international structural norms with advanced weatherproofing, multi-point burglar resistance, and architectural customization.
Enterprise Scale & Reliability
Why Tier-1 Contractors and Global Importers Trust DERCHI
Operating from our intelligent production hub in Foshan, Guangdong Dejiyoupin Doors and Windows Co., Ltd. integrates 25+ years of engineering craftsmanship with strict international certifications.
180,000
m² Production Base
1,000,000+
m² Annual Capacity
100+
Patented Technologies
18,000+
Completed Global Projects
Recognised as a "China Famous Brand" by Xinhua News Agency, DERCHI represents the pinnacle of Chinese architectural engineering. Sourcing aluminium bi-fold doors directly from our factory eliminates intermediary distributor markups while securing guaranteed compliance with rigorous global building codes, including European CE (EN 14351-1), Australian AS2047, North American NFRC/NAFS, and ISO 9001 certified total quality controls.
In-House 30+ R&D Engineers
Continuous innovation in structural rigidity, multi-cavity thermal break extrusions, and heavy-duty concealed bi-fold roller systems supporting up to 150kg per sash.
Exclusive Patented Anti-Burglary Locks
Featuring our proprietary Four-Side Six-Point locking invention, providing RC2/RC3 grade security resistance against forced entry and severe cyclic storm stress.
Full Turnkey Engineering Support
End-to-end oversight covering architectural CAD/BIM shop drawings, structural wind-load simulations, pre-shipment dry runs, and comprehensive installation manuals.
Engineering Whitepaper
Technical Specification & Structural Superiority of Aluminium Bi-Fold Systems
Understanding the critical performance metrics that separate high-end architectural bi-folds from standard commercial-grade units.
Alloy Purity & Wall Thickness
Manufactured using primary architectural billet 6063-T5/T6 or 6060 aluminium alloys. Frame extrusion wall thicknesses strictly observe 2.0mm to 3.0mm structural thresholds, ensuring structural integrity under high lateral wind pressures (Class C5) and preventing sagging over wide-span multi-panel configurations.
Polyamide Thermal Barriers
Equipped with multi-cavity PA66 GF25 (25% glass fibre reinforced) polyamide thermal insulation strips ranging from 24mm to 34mm. Combined with warm-edge spacer bars and inert gas fills, our bi-fold profiles break thermal bridging to achieve impressive overall values down to Uw ≤ 1.3 W/m²K.
Acoustic & Insulating Glazing
Standard architectural configurations support customized double and triple glazed units (up to 44mm overall thickness). Utilizing toughened or laminated low-emissivity glass filled with 90% Argon gas to deliver sound attenuation ratings exceeding Rw 38dB to 42dB in dense urban or highway corridors.
Precision Heavy-Duty Bogies
Bi-fold longevity is fundamentally determined by hardware engineering. DERCHI employs stainless steel quad-roller carriages (316 marine-grade optional) running along hardened alloy tracks, cycle-tested to over 100,000 opening/closing iterations without noticeable friction or tracking misalignment.
Continuous EPDM Weather Gaskets
Three-tier co-extruded EPDM vulcanized sealing gaskets maintain elastic recovery under severe temperature swings (-40°C to +80°C). Concealed internal drainage channels with baffles guarantee Class 9A watertightness (≥ 600Pa) against driving storm rain.
Surface Treatments & Longevity
Electrostatic Qualicoat Class 2 fluorocarbon (PVDF) and AkzoNobel polyester powder coatings deliver 20+ years of UV color retention, resisting chalking, peeling, and corrosion in coastal salt-mist environments (ISO 9227 tested exceeding 3,000 hours).
Industry Foresight
Emerging Procurement Trends in Global Aluminium Bi-Fold Doors (2025–2030)
How stringent carbon targets, modern architectural minimalism, and supply chain digitalization are reshaping global procurement criteria.
1. Ultra-Slim Sightlines & Oversized Glazing
Architectural demand is moving decisively toward minimal frame profiles. Next-generation systems feature interlock sightlines as narrow as 110mm, maximizing natural daylight intake while utilizing structural glazing adhesives to carry panel heights beyond 3.5 meters.
2. Zero-Carbon & Passive House Benchmarks
With regulations like European RE2020, German GEG, and UK Future Homes Standard, buyers no longer accept uninsulated profiles. Sourcing strategies mandate verified EPDs (Environmental Product Declarations), low-carbon recycled aluminium billets, and overall Ud ratings approaching passive standards.
3. Barrier-Free Universal Design (Flush Thresholds)
Modern residential and hospitality projects demand seamless indoor-outdoor transitions. Advanced concealed sub-floor drainage trays coupled with ultra-low floor tracks (under 15mm) allow wheelchair accessibility without sacrificing watertightness.
4. Smart Home Motorization & Integrated Shading
Procurement for luxury estates increasingly requires motorized bi-fold operators integrated with KNX/Zigbee home automation systems, alongside factory-fitted magnetic internal pleated blinds sealed within double glazing units for zero maintenance.
5. Direct Factory DDP & Digital QC Inspection
Importers are bypassing trading companies in favor of direct digital twin tracking. DERCHI provides factory-floor VR inspection, barcoded batch tracking, and full DDP delivery straight to staging warehouses across Europe, North America, and Australia.
Procurement Due Diligence
Frequently Asked Questions by Global Importers & Contractors
Direct technical answers regarding compliance, structural limits, lead times, and shipping security.
What certifications do your aluminium bi-fold doors hold for European and Australian markets?
Our bi-fold doors are CE certified under EN 14351-1 standards and independently tested for air permeability (Class 4), watertightness (Class 9A), and wind load resistance (Class C5). For Australian and Oceanic projects, our products meet the AS2047 standard with complete NATA laboratory test certificates and AS1288 certified safety glass.
What is the maximum span and individual sash weight capacity for custom bi-fold systems?
We engineer custom systems supporting individual sash widths up to 1,200mm and heights up to 3,500mm, with individual panel weights up to 150kg. Structural multi-panel assemblies can extend across openings exceeding 12 meters with up to 10 folding leafs configured in various inward or outward folding sequences.
How do you guarantee thermal efficiency for extreme sub-zero or tropical climates?
We customize profile extrusions to local regional climate zones. For Northern European and Canadian winter conditions, we implement 34mm multi-chamber polyamide thermal barriers paired with triple Low-E argon glazing, yielding Ud ratings below 1.2 W/m²K. For coastal tropical regions, profiles receive specialized drainage cascades and high-durability fluorocarbon anti-corrosion coatings.
How are overseas sea freight risks and potential glass shattering mitigated during export?
Every bi-fold frame and sash undergoes a 100% pre-assembly factory trial fit. For sea container shipping, units are dismounted or folded into dedicated steel-reinforced, fully enclosed fumigated plywood crates. All corners feature ABS high-impact protectors, and glass panels are separated by cork isolation pads and shock-absorbent thermal film.
Can you provide custom RAL colors, anodized textures, and dual-color profiles?
Yes. We offer the entire international RAL Classic palette in smooth matte, semi-gloss, and coarse sand grain finishes. Additionally, we provide custom champagne, bronze, and black anodizing (up to 25μm film thickness), plus authentic thermal-transfer Italian wood-grain textures. Dual-color extrusions (different interior/exterior finishes) are available across all thermal break series.
What is the standard production lead time and minimum order quantity (MOQ)?
As a true manufacturing plant, we accommodate both bespoke architectural residential projects and container-scale commercial developments. Our typical MOQ is 1 set for custom residential villas or sample prototypes. Standard production lead times run between 25 to 35 calendar days following shop drawing confirmation and technical sign-off.
Start Your Fenestration Sourcing With China’s Leading Manufacturer
Whether you require standard CE-certified bi-fold series for commercial distribution or bespoke thermal break patio systems for luxury villa architecture, DERCHI delivers precision engineering and direct factory pricing.