In modern architectural envelopes, the exterior door functions not merely as a barrier, but as a high-performance thermal, acoustic, and security interface. Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) operates at the vanguard of industrial metallurgy, combining 6063-T5/T6 structural aluminium extrusion with advanced multi-chamber thermal isolators to meet the demanding technical standards of European, North American, and Australasian commercial and high-end residential projects.
From heavy-duty commercial entrance portals and thermal-break patio sliders to minimalist Crittall-inspired French doors, each system is engineered for exact shop-drawing compliance and verified environmental durability.
Recognised among China's elite fenestration brands, DERCHI delivers complete OEM/ODM production pipelines from Foshan, Guangdong to Tier-1 international general contractors and European developers.
We use strictly virgin aluminium billet ingots with zero recycled scrap contamination, delivering tensile yields exceeding 205 MPa for oversized architectural pivots and extreme wind loadings.
Complete testing verification for CE marking under EN 14351-1, ISO 9001 quality process control, Australian AS 2047 N6 cyclonic wind testing, and North American UL 10C fire safety integrity.
Chosen by a certified long-term UK Schüco installation partner for extensive multi-villa developments across the United Kingdom, verifying our capacity to meet Europe's strictest dimensional tolerances (±0.5mm).
Heavy-duty export fumigated plywood crates with moisture barrier wrapping. Scheduled direct ocean routes into Rotterdam, Hamburg, Antwerp, and Felixstowe with dedicated CET-hour project support.
Driven by stringent global carbon mandates and changing architectural aesthetics, the fabrication of exterior aluminium doors is undergoing an aggressive technological transformation.
Traditional single thermal break barriers are being superseded by multi-cavity PA66 GF25 (25% glass fibre reinforced) polyamides integrated with silica aerogel infusions. This structural architecture breaks both convective and radiative thermal pathways, driving overall door assembly coefficients below Ud 0.80 W/(m²·K) to satisfy Passive House (Passivhaus) envelope compliance without increasing leaf thickness excessively.
Commercial and luxury residential developments demand seamless aesthetic lines paired with commercial-grade access control. The sector is rapidly standardising on concealed motorized multipoint locking systems. These assemblies feature automated latch retraction, fully integrated 12V/24V cable transits through concealed hinges, and plug-and-play compatibility with building management systems (BMS), biometric scanners, and smart automation (KNX/Crestron).
The elimination of physical architectural barriers has historically presented major water penetration risks. State-of-the-art engineering now deploys subterranean hidden gutter systems beneath flush thresholds. Utilizing precision-extruded aluminium sub-sills paired with self-closing EPDM magnetic drop-seals, our profiles withstand torrential water pressure of 600 Pa (Class 9A under EN 12208) while maintaining zero-step accessibility.
For property developers, distributors, and façade contractors, sourcing exterior doors requires anticipation of carbon tariffs, supply chain shifts, and prefabrication requirements.
With the European Union's Carbon Border Adjustment Mechanism (CBAM) entering full fiscal enforcement, primary aluminium carbon accounting has become a non-negotiable metric. Major procurement contracts now demand verified Environmental Product Declarations (EPD). DERCHI is leading this transition by using hydro-powered smelting ingots, targeting embedded emissions under 4.0 kg CO2/kg Al.
The rapid rise of off-site construction, volumetric steel-frame modular housing, and container mobile homes requires "plug-and-play" fenestration envelopes. Sourcing trends reveal that importers are migrating from standard perimeter frames to pre-flashed, thermally broken structural mounting subsills that cut on-site installation labor by up to 65%.
Ocean container freight volatility has made shipping fully assembled oversized pivot and sliding doors costly per unit. Forward-looking importers increasingly rely on OEM factories offering Complete Knock-Down (CKD) or Semi-Knock-Down (SKD) options with precision corner bracket joints, doubling container volumetric capacity while preserving factory assembly tolerances.
| Test Parameter | Standard / Methodology | DERCHI Factory Benchmark | Architectural Significance |
|---|---|---|---|
| Air Permeability | EN 12207 / ASTM E283 | Class 4 (600 Pa, ≤ 0.5 m³/h·m) | Eliminates envelope infiltration losses and drafts in high-velocity storm conditions. |
| Water Tightness | EN 12208 / ASTM E331 | Class 9A / E1050 (≥ 1050 Pa) | Guarantees zero hydrostatic leaks under extreme horizontal driving rain. |
| Wind Load Resistance | EN 12210 / AS 2047 | Class C5 / N6 Rating (± 4500 Pa) | Engineered for high-rise commercial structures and cyclonic coastal frontages. |
| Thermal Transmittance (Ud) | EN ISO 10077-2 | 0.85 – 1.2 W/(m²·K) | Exceeds UK Part L, German GEG, and IECC building energy codes. |
| Burglar Resistance | EN 1627-1630 (RC) | RC2 / RC3 Resistance Class | High-tensile multi-point locking pins resisting heavy mechanical lever tool attack. |
| Surface Corrosion | Qualicoat / ISO 9227 | Neutral Salt Spray > 3,000 hrs | Seaside-grade fluorocarbon (PVDF) powder coating resisting marine chlorine degradation. |
Clear, technically precise answers addressing engineering submittals, testing credentials, minimum volume requirements, and global logistics execution.
Under the European Union Construction Products Regulation (CPR No 305/2011), all our exterior pedestrian door sets are tested according to harmonised standard EN 14351-1+A2. Prior to production release, our technical office generates project-specific Declarations of Performance (DoP) detailing calculated Ud thermal performance (EN ISO 10077), air permeability, water tightness, and structural wind classifications verified by accredited third-party notified test laboratories.
Our engineering protocol begins with a rigorous review of your project schedule and elevations. Within 48 hours, our drafting studio issues comprehensive 2D CAD shop drawings and 3D Revit/BIM files detailing wall anchors, threshold interfaces, expansion clearances, drainage exits, and structural glass build-ups. Fabrication begins only after formal sign-off on shop drawings, sample finish coupons, and hardware specifications.
For doors fabricated using our extensive standard library of over 300 existing architectural dies, our baseline MOQ is flexible, supporting bespoke luxury villa builds (from 1 unit) up to commercial shipping lots. For custom-engineered extrusion dies tailored to unique client profiles, the MOQ is 1 metric ton of aluminium, with new die tooling completed in 10-14 days. Standard manufacturing lead time is 25-35 calendar days following drawing approval.
Export log packaging is engineered to withstand tropical humidity, multi-axis container handling, and saline environments. Profiles receive a low-tack protective PE film (70 μm) rated for 6 months UV resistance without adhesive transfer. Door units are wrapped in micro-foam cushioning, vacuum-sealed with silica gel desiccant packs, and secured into fully enclosed, fumigated marine plywood cases reinforced with steel strapping.
Yes. Operating our own automated vertical powder-coating and horizontal anodizing facilities, we offer full fidelity to the RAL Classic, RAL Design, and NCS colour systems. Powder coatings strictly adhere to Qualicoat Class 1, Class 2 (Super-Durable), and AkzoNobel Interpon standards. Anodised finishes meet Qualanod standards up to 25 μm for coastal environments. Real-wood veneered aluminium composite surfaces are also available.
Every consignment is delivered with detailed shop installation manuals, exploded 3D assembly guides, and indexed hardware mapping. We maintain an engineering technical desk working across Central European Time (CET) and Greenwich Mean Time (GMT) operating hours to support glazier teams via high-definition video link, providing real-time perimeter alignment, hinge calibration, and perimeter sealing guidance.
Contact our technical sales team for comprehensive shop drawing evaluations, architectural CAD/BIM specifications, and factory-direct project volume pricing.