Pivot System
Modern Aesthetic Thermal Break Aluminum Glass Pivot Door
- German Dorma heavy-duty floor pivot hinge
- Polyamide PA66 GF25 thermal insulation
Direct Manufacturing Portfolio
Precision-Engineered Aluminium Crittall & Architectural Systems
Explore our production-grade fenestration assemblies engineered for luxury residential and commercial architecture. Manufactured with aviation-grade 6063-T6 aluminum alloys, precision miter joints, and thermally broken multi-cavity barrier bars.
Flush Minimalist
Modern Minimalist Invisible Aluminum Flush Door Assembly
- Concealed sub-frame & 3D adjustable hinges
- High-tensile integrated screen netting
Tilt-Turn European
European Custom Aluminum Double Glazed Tilt & Turn Design
- Dual-action micro-ventilation multi-point lock
- Argon gas filled Low-E insulated glazing
Acoustic Insulated
Soundproof Thermal-Break Aluminum Alloy Bay-Window Suite
- Acoustic attenuation Rw up to 42 dB
- Triple-gasket EPDM continuous weatherseals
Crittall Classic
French Grid Aesthetics Slim Black Aluminum Crittall Door
- Heritage 25mm ultra-slim sightline muntins
- Qualicoat Class 2 matte black architectural finish
Security Pivot
Modern Anti-Theft Heavy Minimalist Aluminum Pivot Entry Door
- RC3 burglar resistance certification standard
- Biometric access control & concealed wiring prep
NFRC Certified
Thermal Break Double Glazed French Casement Windows
- Compliant with NFRC, Title 24 & Canadian NBC
- Warm edge technoform spacer bars
Commercial Slider
Heavy-Duty Commercial High-Efficiency Sliding Patio Doors
- Stainless steel tandem rollers (400kg per leaf)
- Flush recessed drainable threshold track
Technical Architecture & Engineering
The Metallurgy & Structural Physics of Modern Aluminium Crittall Systems
Traditional hot-rolled steel Crittall systems revolutionized 20th-century fenestration, yet modern building envelopes demand an evolutionary leap. By re-engineering classic industrial steel sightlines with precision-extruded aluminum alloys and advanced thermal barrier technology, DERCHI solves the persistent structural vulnerabilities of steel—eliminating galvanic rust, thermal bridging, and excessive building dead loads.
Alloy Chemistry: 6063-T6 vs. 6061-T6 Extrusion Structural Matrix
In high-end architectural Crittall manufacturing, profile integrity depends strictly on metallurgical precision. At our 180,000 m² automated production facility, we utilize primary 6063-T6 and structural 6061-T6 aluminum billets containing rigorous silicon (0.2–0.6%) and magnesium (0.45–0.9%) concentrations. Through computerized aging furnaces, the alloy achieves a Webster hardness of ≥12 HW and a tensile yield strength exceeding 205 MPa. This mechanical density allows our OEM/ODM engineering division to mill micro-transom bars down to 20mm–25mm sightlines without sacrificing deflection resistance under intense wind load conditions (certified up to AS 2047 N6 cyclonic thresholds).
Furthermore, exterior Crittall frames must isolate indoor thermal environments. Uninsulated steel conducts thermal energy at ~50 W/m·K, resulting in massive condensation and radiant heat loss. DERCHI integrates reinforced Polyamide (PA66 GF25) thermal breaks with 25% glass fiber reinforcement, engineered with multi-chamber internal geometry. This lowers whole-unit thermal transmittance ($U_w$) down to 1.1 W/(m²·K), effortlessly exceeding IECC 2024, California Title 24, and Canadian National Building Code criteria.
Technical Benchmark: Thermally Broken Aluminium vs. Hot-Rolled Steel Crittall
Verified performance metrics formulated for project architects, facade consultants, and general contractors.
| Engineering Attribute | DERCHI OEM/ODM Aluminium Crittall | Traditional Hot-Rolled Steel | Architectural Performance Impact |
|---|---|---|---|
| Thermal Transmittance ($U_w$) | 0.95 – 1.4 W/m²K (Thermally Broken) | 3.2 – 5.8 W/m²K (Unbroken Steel) | Zero condensation risk; cuts HVAC building loads by up to 38% |
| Mullion Sightlines | 20mm – 32mm (Micro Slim-profile) | 25mm – 40mm (Heavy Steel Web) | Delivers crisp, authentic industrial Bauhaus aesthetics |
| Corrosion Resistance | Qualicoat Class 2 / Marine AAMA 2605 | Susceptible to galvanic oxidation / Rust | Zero filiform corrosion in coastal salt-fog environments (ASTM B117) |
| Dead Weight Impact | 2.7 g/cm³ (~65% Lighter than Steel) | 7.85 g/cm³ (Extremely Heavy) | Reduces floor structural re-engineering and avoids pivot sagging |
| Glazing Flexibility | Up to 42mm Triple-Glazed Low-E Units | Restricted to 8mm–16mm Single/Double | Supports acoustic laminated, switchable PDLC, and argon cavities |
| Precision Lead Times | 4–6 Weeks (CNC Automation) | 14–22 Weeks (Labor Intensive) | Accelerates commercial fast-track construction schedules |
Strategic Horizon 2025–2030
Future Procurement Trends for Global Door & Window Buyers
International project procurement has shifted permanently away from local spot sourcing toward direct factory partnerships. Understand the four driving procurement macro-trends dictating architectural supply chains over the next five years.
Embodied Carbon Accounting & Circular Billets
Developers across North America and Europe are mandated to report Scope 3 emissions under ESG and LEED v4.1 scorecards. OEM buyers now prioritize suppliers utilizing hydro-powered green aluminum smelting with recycled billet content (>50%). Our manufacturing processes incorporate automated scrap recovery and certified Environmental Product Declarations (EPDs), enabling developers to gain up to 8 additional LEED green building credits.
Low-Carbon EPD Ready →Prefabricated Unitized Crittall Modules
Rising jobsite carpentry and glazing labor costs in the US, UK, and Australia have rendered site-glazed multi-lite door grids uneconomical. The global market is shifting rapidly to fully unitized, pre-glazed Crittall screen cassettes. Delivered pre-hung inside sub-frames with calibrated hardware, plug-and-play architectural cassettes reduce onsite installation time from days to under 4 hours per opening.
Plug-and-Play Cassette Preps →BIM Level 3 & Direct-to-Factory CAD Integration
Architects no longer accept static catalogs. Tier-1 procurement now mandates parametric BIM (Revit, ArchiCAD, IFC) models complete with embedded thermal values, deflection tolerances, and hardware prep details. DERCHI’s in-house engineering studio produces custom submittal packages and shop drawings in imperial or metric increments within 48 hours of project brief receipt.
48-Hour CAD Engineering SLA →
Innovation Vector
Technological Innovations in Slim-Profile Fenestration
Modern architectural language demands maximum glass expanses, pristine geometric symmetry, and total sensory refinement. See how our R&D breakthroughs redefine industrial steel-look systems.
Concealed Smart Hardware & Magnetic Locks
Bulky lock cases disrupt Crittall elegance. We engineer invisible CNC lock pockets accommodating magnetic latch mechanisms, motorized concealed multi-point drop bolts, and discreet biometric handle sensors that communicate with Control4, Crestron, and Apple HomeKit protocols.
Acoustic Decoupling & Lamination
By pairing structural aluminum profiles with asymmetric acoustic insulated glass units (e.g., 6mm Toughened + 0.76 Acoustic Sound PVB + 6mm Toughened Low-E), our Crittall partitions attain laboratory-certified STC ratings up to 43 dB, safeguarding executive privacy in corporate suites.
True Divided Lites (TDL) vs. SDL Grids
We provide both True Divided Lite (TDL) systems using individual glass lites bounded by structurally joined glazing bars, and Simulated Divided Lite (SDL) systems featuring high-bond structural 3M VHB thermal muntin bars with internal spacer grilles for peak thermal performance.
Seamless Zero-Threshold Transitions
Eliminate trip hazards between indoor living spaces and exterior entertainment patios. Our flush drainage tracks integrate hidden internal weeps, vortex water evacuation channels, and ADA-compliant stainless steel threshold grates engineered to withstand driving rain.
Enterprise Manufacturing Scale
Guangdong Dejiyoupin: Over 25 Years of Door & Window Mastery
DERCHI is the flagship high-end export fenestration brand of Guangdong Dejiyoupin Doors and Windows Co., Ltd. Operating from our state-of-the-art 180,000 square meter industrial park in Foshan, Guangdong, we represent one of Asia’s most technically advanced manufacturing bases for custom architectural systems.
With over 600 skilled technicians, automated Italian Emmegi 5-axis CNC machining centers, and an in-house powder coating line certified to Qualicoat Class 2 standards, we eliminate trading intermediaries. Our dedicated North American and European export divisions handle everything from CAD drawing generation to export crating and overseas project logistics.
180,000m²
Intelligent Production Base
600+
Specialized Technicians
100+
Certificates & Global Patents
25+
Years Engineering Pedigree
Certified Quality Verification
AS 2047 N6 Cyclonic, CE EN14351-1, ISO 9001, and UL 10C Fire-Rated Compliance Standards.
Procurement Knowledge Base
Frequently Asked Questions
Direct, transparent technical answers to key questions asked by architects, commercial general contractors, and overseas fenestration distributors prior to contract sign-off.
Need Custom Spec Consultation?
Our structural engineers review door schedules, rough opening drawings, and thermal wind load requirements daily during EST and PST working hours.
Contact Us1. How do your aluminium Crittall doors achieve authentic heritage steel aesthetics?
We machine custom extrusion dies that reproduce the classic stepped-profile look of traditional W20 and SMW steel profiles. By utilizing 6063-T6 aluminum, we achieve ultra-slim mullion sightlines down to 20mm–25mm while employing deep chamfered glazing beads. Finished with Qualicoat Class 2 ultra-matte black, dark bronze, or anthracite textured coatings, our finished doors visually match historic steel doors while providing superior thermal and acoustic performance.
2. Can you manufacture to custom imperial rough opening sizes and door schedules?
Yes, 100% bespoke fabrication is our primary OEM/ODM capability. Simply forward your door schedules, floor plans, or rough opening dimensions in either inches or millimeters. Our dedicated engineering department prepares millimeter-accurate CAD shop drawings and 3D cross-sectional elevations for structural review and owner sign-off prior to releasing profiles to the CNC production lines.
3. How do you prevent air and water infiltration on large double Crittall French doors?
We resolve meeting-stile vulnerabilities through an interlocking aluminum astragal profile engineered with continuous vulcanized EPDM compression gaskets. Combined with concealed German-engineered multipoint shoot-bolt hardware, the active and passive door leaves seal tightly against top and bottom rebated jambs. For external applications, our systems include subterranean threshold water deflectors tested to withstand dynamic water pressures exceeding 450 Pa (compliant with ASTM E331 and EN 12208 Class 9A).
4. What glass configurations are available for exterior and interior Crittall systems?
For exterior doors, we offer double and triple insulated glass units (IGUs) up to 42mm in overall thickness, featuring tempered safety glass, laminated hurricane PVB interlayers, argon gas filling, and soft-coat Low-E layers (PPG Solarban series). For interior partitions, we provide 8mm–12mm monolithic toughened glass, fluted/reeded textured privacy glass, acid-etched frosted glass, or smart switchable PDLC glass for instant electrical privacy.
5. What are the maximum leaf height and weight limits for your Crittall pivot systems?
With our structural heavy-duty internal tie-rod reinforcing system and German Dorma/FritsJurgens pivot assemblies, we fabricate oversized architectural pivot leaves up to 4,000mm (13.1 ft) in height and 2,200mm (7.2 ft) in width, with leaf weights reaching 500 kg (1,100 lbs). The concealed hardware provides 180° swing freedom, 90° hold-open detents, and micro-adjustable closing speed dampening.
6. How do you package and protect custom fenestration for international ocean freight?
Export protection is critical. Every unit undergoes multi-layer packing: first, non-scratch protective film on all finished surfaces; second, 10mm high-density pearl cotton corner shields; third, heavy-duty shrink-wrap; and finally, packaging inside IPPC-certified fumigated solid plywood crates with integrated structural steel forklift runners. Crates feature shock indicators and silica gel desiccant packs to prevent moisture condensation during sea voyages.
7. What certifications and testing reports accompany your shipments?
Shipments can include full documentation verifying ISO 9001 factory compliance, CE Declaration of Performance (DoP), Australian AS 2047 / AS 1288 physical test reports, NFRC thermal performance certificates, and SGCC / IGCC safety glazing compliance. Fire-rated assemblies include test certifications meeting UL 10C and BS 476 Part 22 fire resistance ratings up to 60/90 minutes.
8. What are typical OEM/ODM production lead times and Minimum Order Quantities (MOQ)?
We support both bespoke single-residence architectural projects and multi-container commercial developer contracts. Standard MOQ is 1 set for custom villas and mockups, with project-tier volume pricing for full container loads (20GP / 40HQ). Standard production lead times run 25–35 days following final CAD shop drawing sign-off and finish sample verification.