Featured Commercial & Residential Glazing Solutions
Explore our precision-crafted exterior doors and architectural window assemblies. Each unit incorporates multi-cavity aerospace-grade aluminium extrusions, high-performance thermal barriers, and impact-rated insulated glass designed for luxury villas, hospitality resorts, and high-spec building envelopes worldwide.
Originating in 1884 with Francis Henry Crittall's patented rolled steel frames, the iconic grid-like, multi-pane fenestration aesthetic shaped industrial modernism and the Bauhaus movement. However, when applied to modern external building envelopes, traditional single-glazed uninsulated solid steel frames pose critical challenges: acute thermal bridging, condensation pooling, rapid rust oxidation in coastal microclimates, and extreme overall weight exceeding 85 kg/m².
As a specialized high-performance fenestration manufacturer, Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) has re-engineered this heritage architectural form using thermal break aerospace-grade 6063-T6 extruded aluminium alloy. By incorporating continuous polyamide insulating bars (PA66 GF25 with 25% glass fiber reinforcement), our CE-certified aluminium Crittall-style external doors achieve an impressive thermal transmittance value as low as Uw ≤ 1.2 W/(m²·K) while preserving the timeless ultra-slim 32mm–38mm sightline profile that architects demand.
| Engineering Attribute | Traditional Hot-Rolled Steel | Standard Non-Thermal Aluminium | DERCHI CE Thermally-Broken Aluminium Crittall |
|---|---|---|---|
| Thermal Transmittance (Uw) | 4.8 – 5.6 W/(m²·K) (Heavy condensation) | 3.8 – 4.5 W/(m²·K) | 0.9 – 1.3 W/(m²·K) (Passive Capable) |
| Sightline Interlock Width | 25mm – 32mm (Extremely rigid) | 55mm – 75mm (Bulky look) | 30mm – 36mm (Authentic Heritage Look) |
| Corrosion & Salt-Spray Class | Prone to rust at weld joints (Grade C2) | Standard Anodized (Grade C3) | Qualicoat Seaside Class 2 Powder Coat (Grade C5) |
| Glazing Pocket Capacity | Single glazed 6mm – 14mm max | Double glazed 18mm – 24mm | Double/Triple DGU: 28mm to 42mm Low-E Argon |
| Structural Deflection (Wind Load) | Heavy dead-load, deformation over time | Moderate wind resistance | AS 2047 N6 (Design Pressure >4500Pa) Cyclonic |
| Multi-Point Security Rating | Single or dual face mortise latch | Basic 3-point lock | EN 1627 RC3 / PAS 24 5-Point Hook Bolt System |
Procurement managers and facade engineering consultants for luxury estates, boutique hotels, and residential developments across the United Kingdom, Europe, North America, Australia, and Southeast Asia are experiencing a structural paradigm shift in door specification. The future of exterior fenestration is governed by strict embodied carbon goals, stringent airtightness standards, and advanced pre-hung modularization.
With European Energy Performance of Buildings Directive (EPBD) updates and UK Part L building regulations mandating rigorous whole-door U-values (≤ 1.4 W/m²K), procurement contracts now disqualify uninsulated exterior systems. B2B buyers require certified warmup edge warm-spacer bars, double Low-E soft-coat glazing filled with 90% argon gas, and multi-chamber thermal breaks.
Industrial style no longer means historic compromise. Commercial developers require invisible concealed European multi-point shootbolts, heavy-duty 3D adjustable pivot hinges embedded in the top transom and floor box, alongside smart IoT access control—including motorized lock integration with smart home automation and biometric recognition without altering the slim frame silhouette.
Labor shortages in Western job sites make site-glazing steel grids economically unfeasible. Modern procurement strategies prefer 100% factory pre-hung, squareness-tested, and pre-glazed cassette assemblies. Surface treatments have shifted exclusively to Qualicoat Class 2 ultra-durable powders or PVDF coatings capable of passing 3,000+ hours of acetic acid salt spray (AASS) tests for coastal resiliency.
For cross-border developers and general contractors importing building materials into the European Economic Area, the United Kingdom (UKCA), and international territories, compliance with EN 14351-1:2006+A2:2016 (Windows and pedestrian doorsets) is an absolute statutory prerequisite. DERCHI manufactures external Crittall-style doors under factory production control systems audited to ISO 9001:2015, ensuring complete traceability from aluminium ingot extrusion billet through to structural silicone vulcanization.
Every container shipped from our 180,000 m² facility is accompanied by a formal CE Declaration of Performance (DoP) detailing certified metrics:
- Air Permeability (EN 12207): Class 4 (Maximum tightness at test pressures up to 600 Pa, eliminating air infiltration and draft whistling).
- Water Tightness Under Static Pressure (EN 12208): Class 9A / E1050 (Hermetically sealed up to 1050 Pa torrential driving rain test).
- Resistance to Wind Load (EN 12210): Class C5/B5 (Tested at gust wind pressures of ±3000 Pa with frame deflection below L/300).
- Acoustic Performance (EN ISO 10140-2): Sound reduction index up to Rw (C; Ctr) = 42 (-1; -4) dB utilizing asymmetrical laminated acoustic PVB interlayers.
- Impact Safety & Burglar Resistance (EN 1627-1630): Class RC2 / RC3 security rating utilizing hardened steel anti-drill plates and anti-lift pin hinges.
Headquartered in the global fenestration manufacturing capital of Foshan, Guangdong, Guangdong Dejiyoupin Doors and Windows Co., Ltd. stands as a recognized Top 10 brand in China's architectural aluminium industry. Our extensive manufacturing ecosystem eliminates middleman markups, reduces project delivery risk, and ensures unmatched engineering precision for bespoke commercial and residential commissions.
Equipped with automated Italian 5-axis CNC machining centers, automated robotic powder coating lines, and insulated glass argon gas filling units ensuring high-speed output with millimetric tolerances.
Our in-house facade engineers provide complimentary CAD shop drawings, BIM families, structural wind-load calculation reports, and project-specific thermal analysis models within 24 hours.
Beyond European CE, our structural window and door systems hold Australian AS 2047 accreditation at the highest N6 Cyclonic category, surviving super typhoons in the Philippines, Florida, and the Pacific.
Every single Crittall grid external door undergoes 100% full-frame trial assembly, diagonal squareness verification, seal airtightness inspection, and video recording prior to export crating.
Direct, verifiable answers to the most critical technical, commercial, and compliance questions raised by international quantity surveyors, project architects, and fenestration distributors.
Authentic solid steel profiles inevitably suffer from weld galvanic corrosion and rust streak seepage when exposed to coastal salt spray (chlorides). DERCHI's thermally-broken aluminium systems utilize high-purity 6063-T6 extrusions treated with pre-anodizing or Qualicoat Seaside Class 2 architectural powder coatings, backed by a 15-to-25 year warranty against peeling, bubbling, and oxidation.
We engineer dual-pane (DGU) or triple-pane (TGU) sealed units with a minimum 16mm argon gas cavity, warm-edge stainless steel/composite spacer bars, and dual-layer silicone secondary seals. Coupled with a 24mm to 34mm polyamide PA66 thermal barrier within the aluminium sash, interior condensation is entirely eliminated down to -25°C exterior temperatures.
We offer two architectural systems: (1) Authentic Individual Glazing Panes with true structural intermediate transoms/mullions for high security, and (2) High-Performance Astragal Bars (Simulated Divided Lites - SDL) where exterior and interior precision-milled aluminium grids are adhered to single large glass lites with internal duplex shadow spacer bars, achieving higher thermal efficiency and easier cleaning.
Yes. Utilizing our specialized structural pivot systems with heavy-duty German concealed hydraulic floor closers (such as Dorma or Geze hardware), we fabricate single leaf pivot Crittall doors up to 2.4 meters wide and 4.2 meters high, supporting sash weights exceeding 450 kg with whisper-quiet, single-finger operation.
For every project, DERCHI provides a comprehensive technical submittal package including the CE Declaration of Performance (DoP) under EN 14351-1, third-party laboratory test reports for air, water, and structural wind resistance (AS 2047 / ASTM E283, E330, E331), glass temper safety certificates (EN 12150 / ANSI Z97.1), and CAD structural anchor shop drawings.
Standard custom production requires 25 to 35 business days following CAD shop drawing approval. For overseas transit, doors are wrapped in PE protective film, encapsulated in pearl cotton buffer layers, corner-guarded with high-density polyurethane blocks, and sealed into non-fumigation plywood crates with internal desiccants to prevent maritime humidity damage.