Acoustic Class
Aluminium Glass Sliding Folding Doors Accordion Folding Doors to Sydney Perth Soundproof Accordion Door
Rw 42 dB
AS 2047 Verified
Double Glazed
Engineered Systems Portfolio
Specification-Grade Aluminium Concertina Door Solutions
Direct factory configurations manufactured with certified 6063-T6 architectural aluminium alloys, polyamide thermal breaks (PA66 GF25), and heavy-duty concealed bottom tandem rollers. Fully customizable to bespoke structural openings and seismic ratings.
Acoustic Class
Heavy-Duty
AOSTTER Large Size Concertina Aluminum Folding Door with Multi-Point Locking Sound Dampening Glass for Balcony
Multi-Point Lock
Span Up to 12m
Balcony Grade
Thermal Break
DEMEA Soundproof Home Office Garden Room Aluminium Frame Double Glazing Custom Made Accordion Style Concertina Folding Door
Uw 1.4 W/m²K
Garden Rooms
Narrow Sightline
Storm Rated
Aumegi Windproof Folding Aluminum Frame Glass Stack Bifold Door Concertina Folding Door Bifold Patio Doors
Class 4 Air Perm
Class 9A Water
Patio Integration
Smooth Glide
JUNYAO Factory Smooth Glide Roller Track Concertina Fold Aluminium Accordion Doors NFRC CE AS2047 Hotel Residential Villa
Stainless Bogie
CE & NFRC
Hotel Commercial
Typhoon Class
Custom Heavy Duty Aluminum Concertina Bi-Fold Door Storm Proof EPDM Sealing Stackable Folding Glass Door Buildgres 5-Year
EPDM Vulcanized
N6 Cyclone Class
Heavy Duty 3.0mm
Smart Building
Aluminium Bi Fold Smart System Bi Fold Doors Commercial Concertina Folding Door Design
BMS Automated
High Traffic 100k
Integrated Access
Flush Threshold
Design Contemporary Bifold Doors Concertina Glass Doors Collapsible Glass Partition
Barrier-Free ADA
Minimal Bezel
Internal Partition
Enterprise Scale & Proven Reliability
Guangdong Dejiyoupin (DERCHI): Industrial Authority
Operating from Foshan, Guangdong, our enterprise infrastructure delivers industrial-scale precision fenestration to world-class architectural projects across Europe, North America, Australia, and Southeast Asia.
Top 10 Manufacturing Authority
Recognized among the Top 10 premium door and window manufacturing powerhouses in China, Guangdong Dejiyoupin Doors and Windows Co., Ltd. brings 25+ continuous years of specialized fenestration manufacturing, combining German extrusion precision tooling with high-volume ISO 9001 certified execution.
Uncompromising CE & AS2047 Compliance
Our aluminium concertina systems are fully audited to European harmonized standard EN 14351-1 (CE mark), Australian AS 2047 N6 cyclonic testing, and UL fire classifications. Complete Factory Production Control (FPC) records, initial type testing (ITT) dossiers, and Declarations of Performance (DoP) are provided for seamless regulatory handover.
Global Project Proven Track Record
From landmark hospitality resorts in Sydney and Manila (exhibited at WORLDBEX 2025) to multi-family residential developments across the United States, Canada, and the United Kingdom, our facade assemblies endure extreme environments: coastal saltwater saline, seismic ground movements, and intense typhoon wind loading.
Technical Whitepaper Section
Engineering Principles of High-Performance Concertina Systems
Aluminium concertina (bi-fold) doors serve as both an expansive architectural transition and a high-load structural exterior wall. Engineering a high-performance concertina facade requires rigorous balancing of structural deflection, thermal separation, water evacuation, and cycle life durability.
Polyamide Thermal Barriers
Standard architectural aluminium exhibits high thermal conductivity (k ≈ 160 W/m·K). To achieve European Energy Performance of Buildings Directive (EPBD) compliance, our systems incorporate 24mm to 34mm multi-chambered Polyamide 66 reinforced with 25% glass fibre (PA66 GF25).
This thermal barrier resists shear stress up to 70 MPa while limiting overall system thermal transmittance to Uw ≤ 1.30 W/m²·K when matched with warm-edge triple argon low-E insulating glass units (IGUs).
Kinematic Roller Mechanics
A concertina door system relies heavily on kinetic roller engineering. DERCHI concertina doors implement precision-ground, four-wheel tandem bottom stainless steel bogies with integrated needle bearings rated for up to 300 kg per sash.
By positioning the primary operating weight on the bottom track rather than hanging from the lintel, header deflection deflection stresses on structural concrete beams are significantly mitigated, ensuring featherlight gliding over 100,000 continuous opening cycles.
EPDM Triple Barrier Weather Sealing
Water infiltration in accordion systems frequently occurs at folding hinge knuckles and meeting stiles. We deploy continuous, vulcanized cellular Ethylene Propylene Diene Monomer (EPDM) gaskets.
Coupled with concealed drainage channels, internal weep holes, and an integrated pressure-equalized rain-screen chamber, our concertina assemblies comfortably achieve Class 9A (600 Pa) water tightness under EN 12208 without requiring raised, unpassable trip thresholds.
| Performance Parameter | European Harmonized (EN / CE) | Australian Standard (AS) | North American (AAMA/WDMA/NFRC) | DERCHI Factory Benchmark |
|---|---|---|---|---|
| Structural Wind Load Resistance | EN 12210: Class C3 / B4 (1600 Pa) | AS 2047: N6 / Cyclonic C4 | DP Rating: DP 50 - DP 70 | Class C5 / N6 (Up to 3600 Pa Design) |
| Air Permeability (Infiltration) | EN 12207: Class 4 (≤ 3 m³/h·m²) | AS 2047: < 0.5 L/s·m² | ASTM E283: ≤ 0.10 cfm/ft² | Class 4 (< 0.12 m³/h·m² at 600 Pa) |
| Water Tightness Under Static Head | EN 12208: Class 9A (600 Pa) | AS 2047: 450 Pa - 600 Pa | ASTM E331: Pass 12 psf (575 Pa) | Class E900 (900 Pa Watertight Test) |
| Thermal Transmittance (Uw) | EN ISO 10077-1: Uw ≤ 1.6 W/m²K | BCA Climate Zones 1-8 Compliant | NFRC U-Factor: 0.24 - 0.32 | Uw 1.15 - 1.40 W/m²K (Custom Glazing) |
| Acoustic Attenuation (STC / Rw) | EN ISO 717-1: Rw 36 - 42 dB | Rw + Ctr ≥ 34 dB | ASTM E90: STC 38 - 44 | Rw 42 dB (Laminated Acoustic Spec) |
| Operating Durability & Wear | EN 1191: 20,000 cycles | AS 2047: Type-tested operation | AAMA 920: Pass Cycle Lifecycle | 100,000 Verified Continuous Cycles |
| Security & Intrusion Resistance | EN 1627: RC2 / RC3 (PAS 24:2022) | AS 5039 Security Specification | ASTM F588 Forced Entry Grade 40 | RC2 / PAS 24 Multi-Point Dog-Bolt Locks |
Critical Manufacturing Insight: Extrusion Profile Wall Thickness
While consumer-grade residential folding doors frequently utilize 1.2mm to 1.4mm profile thicknesses to minimize raw material cost, certified architectural concertina doors intended for spans exceeding 2.6 meters in height mandate profile wall thicknesses between 2.0mm and 3.0mm (EN AW-6063 T6). Insufficient profile wall thickness causes frame twisting under wind load, leading to latch misalignment, air gasket compression loss, and catastrophic track jamming over time.
Market Intelligence
Future Procurement Trends in Architectural Fenestration (2025–2030)
Global real estate developers, facade sub-contractors, and procurement directors are navigating structural changes in international supply chains, sustainability certifications, and project delivery paradigms.
1. Circularity & Low-Carbon Aluminium (Scope 3 Mandates)
By 2026, the European Union's Carbon Border Adjustment Mechanism (CBAM) and international green building benchmarks (LEED v4.1, BREEAM, Green Star) will severely penalize fenestration manufactured using fossil-fuel powered primary smelters. Tier-1 procurement teams are transitioning exclusively to factories utilizing hydro-smelted low-carbon aluminium billets (≤ 4.0 kg CO₂e/kg Al) and recycled scrap post-consumer aluminium alloys.
DERCHI has proactively aligned factory purchasing pipelines to guarantee certified Environmental Product Declarations (EPDs), enabling developers to gain critical embodied carbon credits without compromising tensile strength.
2. Fully Knocked-Down (CKD) vs. Pre-Glazed Modular Logistics
Ocean freight volatility has driven a major shift in shipping methodologies. For ultra-large openings (10 to 14 panels), procurement executives increasingly evaluate Complete Knocked-Down (CKD) kits versus fully pre-assembled, unitized panels with factory-installed IGUs.
Our Foshan manufacturing facility offers hybrid crating: precision CNC-notched frames equipped with pre-crimped corner cleats, pre-installed EPDM gaskets, and factory-drilled mortise locks, dramatically reducing site assembly time by 65% while maximizing container cubic space (averaging 350% more linear meters per 40ft HQ container compared to assembled units).
3. Digital Twin & BIM LOD 350 Sourcing Integration
Paper submittals are obsolete in high-tier commercial contracting. Architectural specifiers now demand building information modeling (BIM) components at Level of Development (LOD) 350 or 400. Sourcing decisions hinge on whether the factory engineering department can export precise Revit (.rfa) and IFC files detailing actual anchor load distributions, thermal isotherm simulation maps, and glass edge clearances.
Our in-house technical studio generates parametric 3D CAD/BIM shop models within 48 hours of project parameter receipt, minimizing coordination discrepancies between structural steel contractors and glazing sub-trades.
4. Whole-System Liability & Consolidated Hardware Sourcing
Fragmented sourcing—procuring extrusions from one region, rollers from another, and multi-point locks from a third-party distributor—creates catastrophic warranty ambiguities when an exterior door fails air or water commissioning tests on site. Modern procurement leans toward single-source responsibility.
DERCHI integrates complete proprietary or Tier-1 German hardware systems (Siegenia, Roto, Hoppe, or custom heavy-duty DERCHI kinesthetic assemblies) under a unified 5-to-10 year factory-backed warranty covering profiles, finish integrity, and operational mechanism life.
Fenestration Innovation
State-of-the-Art Technological Developments
Concertina doors have evolved from clumsy, heavy folding patio barriers into ultra-slim, barrier-free, whisper-quiet architectural glass kinetic installations.
Ultra-Minimalist Sightlines
Historically, folding door sash-to-sash stiles measured 140mm to 180mm across, obscuring panoramic vistas when closed. Advanced structural finite element analysis (FEA) has enabled our engineers to reduce the visible mullion profile to just 108mm–115mm while maintaining compliance with extreme cyclone wind pressures.
This provides an unprecedented 92% glass-to-frame ratio, delivering unobstructed natural daylighting and panoramic aesthetic continuity.
Concealed Drainage & ADA Thresholds
Bridging indoor and outdoor living requires eliminating unsightly floor steps. Traditional weathered rebated sills present significant trip hazards for luxury homes, hospitality venues, and wheelchair accessibility (ADA / UK Part M compliance).
Our patented flush threshold incorporates submerged continuous linear channel drains with internal back-check valves. Water is evacuated laterally beneath finished terrace decking, allowing a zero-step, perfectly level finish that resists heavy driving rains.
Building Management System (BMS) Automation
Manual operation of multi-panel partitions exceeding 400 kg is being replaced by concealed brushless DC electromagnetic motor drives. Integrated directly within the top structural track, smart concertina systems sync with HVAC automation networks.
When wind, air quality, or temperature sensors detect optimal external conditions, panels cascade open silently. Safety features include infrared multi-beam pinch sensors and optical obstacle auto-reversal protocols.
Procurement Advisory
Frequently Asked Questions for Commercial Buyers & Specifiers
In-depth technical answers addressing regulatory compliance, structural design loads, logistics, surface durability, and installation tolerances.
Q1 What distinguishes authentic CE certification from standard manufacturer factory declarations?
Authentic CE certification under EN 14351-1:2006+A2:2016 requires third-party Notified Body testing (System 3 or System 1 Assessment and Verification of Constancy of Performance - AVCP). Testing covers wind load resistance (EN 12210), water tightness (EN 12208), air permeability (EN 12207), and acoustic properties (EN ISO 717-1). Guangdong Dejiyoupin provides full accredited test reports and factory production control declarations, ensuring frictionless acceptance by municipal building control officers and facade consultants across the European Union.
Q2 Should top-hung or bottom-rolling concertina hardware be specified for large openings?
For structural openings exceeding 6 meters wide or 2.8 meters in height, bottom-rolling (bottom-loaded) systems are universally recommended by facade engineers. Top-hung doors place massive dead loads directly on the overhead building lintel or concrete beam, which can deflect over time. A deflection of just 4mm to 6mm in a top lintel will bind top-hung rollers, rendering the door inoperable. Bottom-rolling mechanisms transfer 95% of panel mass down to the structural floor slab, ensuring trouble-free kinematics over decades.
Q3 What surface finish standard is required for coastal resort and high-salinity marine projects?
For installations within 3 kilometers of open saltwater or aggressive marine zones, standard architectural powder coatings degrade rapidly. We specify Qualicoat Class 2 / Class 3 Super-Durable polyester powders or fluoropolymer PVDF (Kynar 500) coatings with a minimum dry film thickness of 60–80 microns, proven to withstand over 3,000 hours of continuous neutral salt spray (ASTM B117) without blistering. Alternatively, 25-micron marine-grade architectural anodizing (AAMA 611 Class I) provides unmatched scratch resistance and long-term surface protection.
Q4 What are the maximum sash dimensions and glass weight capacities for DERCHI concertina systems?
Our heavy-duty commercial profiles accommodate individual folding sashes up to 1,200mm in width and 3,600mm in height, with maximum single-sash weights reaching 150 kg (or up to 300 kg with reinforced multi-axle bogie assemblies). Total continuous opening spans can comfortably reach 15 meters using 10 to 14 panels configured in either un-split single-direction stacking or split bidirectional accordion folds (e.g., 5+1, 7+0, 3+3, or 5+5).
Q5 How does the factory ensure container sea-freight protection against scratching and glass breakage?
Exported units undergo an engineered multi-stage packaging protocol: First, aluminum extrusions are encased in low-tack protective film; second, entire sashes are wrapped with high-density shock-absorbing EPE foam and heavy-gauge corrugated edge-guards. Finally, products are loaded into custom-built, fumigated solid timber ISPM-15 compliant plywood crates equipped with internal moisture-absorbing silica gel packs. Crates feature bottom forklift skids and reinforced steel corner strapping, preventing racking, moisture ingress, or transit vibration damage during ocean transit.
Q6 Can custom glass specifications (bulletproof, acoustic laminate, solar control) be integrated at the factory?
Yes. Our CNC glass-processing division fabricates integrated Insulating Glass Units (IGUs) matching architect-specified performance envelopes. Options include laminated safety glass (PVB/SentryGlas interlayers for cyclone/forced-entry resistance), low-iron ultra-clear glass, warm-edge spacers filled with 90%+ Argon gas, and specialized low-emissivity (Low-E) coatings (such as Saint-Gobain or AGC solar control films) achieving solar heat gain coefficients (SHGC) down to 0.22.
Q7 What lead times and production capacities can commercial contractors anticipate?
With our dedicated 180,000 m² automated production floor and 600+ personnel, standard project cycles run 20 to 30 calendar days from finalized CAD shop drawing sign-off to factory gate container loading. For urgent multi-container development schedules, expedited project manufacturing lanes can deliver high-volume batches on scheduled staggered release timelines. Full production tracking photos and quality sign-off videos are submitted to client procurement teams at every critical fabrication phase.
Q8 How does DERCHI support remote on-site installation and field verification?
Every custom system is fully pre-assembled, squared, and kinematics-tested at the factory before packing. Panel stiles, tracks, and frames are sequentially numbered with laser-etched identification codes corresponding directly to the supplied project installation schematic. We provide high-resolution 3D step-by-step video installation manuals, detailed anchor-fastener torque calculation sheets, and real-time live video technical support directly with our senior fenestration engineers in Foshan.
Plan Your Architectural Project with Factory Engineers
Whether you require structural wind-load engineering, custom CAD shop drawings, acoustic simulation reports, or direct factory pricing for your upcoming project, our bilingual senior engineering team provides detailed technical proposals within 24 hours.
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