Portfolio Matrix
Specialized Aluminium Architectural Fenestration Systems
Our heavy-duty extruded profiles, reinforced multipoint locking hardware, and EPDM micro-gaskets deliver uncompromising air tightness, water barrier protection, and high acoustic attenuation for Hanoi's high-density urban geography.
180,000㎡
Foshan Manufacturing Base
25+
Years Fenestration R&D
AS 2047N6
Typhoon Wind Load Class
100+
Global Patents & Certifications
Subtropical Microclimates
Engineering Small Aluminium Windows for Hanoi's Built Environment
Hanoi’s unique climate blends extreme summer heat index peaks above 42°C, relentless typhoons sweeping across the Gulf of Tonkin, high urban airborne PM2.5 particles, and persistent winter humidity known locally as "trời nồm". Standard residential windows suffer rapid seal degradation, air leakage, and oxidation under these conditions.
Tube Houses ("Nhà Ống") & Narrow Light Wells
Hanoi’s signature architectural vernacular—long, narrow multi-story shophouses across historic districts like Hoàn Kiếm, Đống Đa, and Cầu Giấy—requires optimized airflow through minimal exterior wall profiles. Our compact aluminium awning and hopper units integrate perfectly into narrow vertical ventilation shafts and internal air wells, enabling natural chimney effect cooling while locking out torrential monsoon downpours.
Combating "Nồm Ẩm" Moisture & Microbial Growth
During late winter and spring, humidity consistently hits 95%–100%, causing interior condensation on cold surfaces. Conventional timber profiles warp, rot, and harbor mold, while low-grade non-thermal aluminium sweats profusely. Our precision-engineered polyamide PA66 thermal barrier coupled with multi-cavity EPDM seals creates an unbroken thermal boundary that stops structural condensation dead in its tracks.
Acoustic Attenuation Near Ring Roads & Flyovers
Dense arterial routes like Vành Đai 3, Ring Road 2, and densely packed commercial corridors suffer continuous ambient traffic noise exceeding 75–85 dB. By utilizing structural double-glazed laminated acoustic glass (6mm + 1.14PVB + 6mm) mounted in rigid 6063-T5 aluminium chambers, our small window units deliver a documented sound transmission reduction exceeding Rw 38–42 dB.
Industry Whitepaper
Trends Shaping High-Performance Fenestration in Northern Vietnam
A technical assessment of building codes, materials engineering, and environmental challenges driving specification shifts across Hanoi, Hải Phòng, and surrounding industrial growth corridors.
1. Enforcement of QCVN 09:2017/BXD Energy Efficiency
Vietnam’s Ministry of Construction is aggressively mandating energy efficiency metrics for commercial facilities and mid-to-high-rise residential envelopes. Buildings with Window-to-Wall Ratios (WWR) over 30% must meet rigorous Solar Heat Gain Coefficients (SHGC ≤ 0.35) and overall thermal transmittance (U-factor ≤ 2.2 W/m²·K). Contractors are abandoning plain monolithic glazing for our Low-E insulated glazing units (IGU) fitted in thermally broken subframes.
2. Coastal Typhoon Resilience (AS 2047 N6 Equivalent)
Super typhoons originating in the Pacific regularly track inward over the Red River delta, bringing gust pressures exceeding 2.0–3.0 kPa. Small windows installed on high-elevation apartment facades (e.g., Nam Từ Liêm, Tây Hồ) endure tremendous localized cyclic wind loads. Our profiles utilize reinforced corner crimping processes with two-component polyurethane adhesives, ensuring zero water infiltration at 450 Pa static water pressure.
3. Fluorocarbon (PVDF) & Electrophoretic Coating Longevity
Hanoi’s intense sulfur dioxide (SO₂), nitrogen oxide emissions, and coastal saline carry-over from Hải Phòng attack architectural paint within 24 to 36 months. Our export-grade aluminium profiles feature a minimum 3-coat system of AAMA 2605 compliant PVDF fluorocarbon coatings, tested against continuous 4,000-hour accelerated salt spray testing with zero chalking or blistering.
| Performance Parameter | Conventional Vietnam Local Market Profiles | DERCHI Engineered Small Window Series | Operational Impact for Hanoi Buildings |
|---|---|---|---|
| Aluminium Alloy & Temper | Recycled 6063 T4/T5 (uncontrolled impurities) | Primary billet 6063-T6 / 6060-T6 architectural grade | Resists high cyclic wind deformation without frame distortion |
| Thermal Barrier Core | None (solid metal cross-section conduction) | Polyamide PA66 reinforced with 25% glass fiber | Eliminates "Trời Nồm" sweating and lowers HVAC consumption by 32% |
| Surface Protective Finish | Thin powder coating (40–50 μm, AAMA 2603) | AkzoNobel/PPG PVDF fluorocarbon (≥80 μm, AAMA 2605) | Guaranteed 20+ year colorfastness against urban smog and UV degradation |
| Gasket & Perimeter Sealing | Low-cost PVC or sulfur-vulcanized rubber | Co-extruded EPDM cellular sponge with corner vulcanization | Maintains elasticity under 40°C heat spikes; prevents monsoon leaks |
| Acoustic Rating (STC / Rw) | Rw 22–26 dB (monolithic 5mm single glass) | Rw 38–44 dB (laminated insulated glass assemblies) | Blocks heavy motorbike traffic noise, horn honking, and urban drone |
Manufacturing Might
Why Project Developers in Vietnam Rely on DERCHI
Headquartered in Foshan, Guangdong—the epicentre of global architectural aluminium fabrication—Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) has established comprehensive export infrastructure directly serving Northern and Southern Vietnam.
180,000㎡ Intelligent Facility
Employing over 600 skilled technicians, automated CNC cutting double-mitre saws, German four-corner crimpers, and clean-room insulated glazing lines capable of running 500,000+ sqm of fenestration annually.
Verified Testing & AS 2047
Our window profiles are independently audited under ISO 9001, European CE, UL fire door listings, and Australia’s stringent AS 2047 N6 rating for structural air, water, and wind deflection limits.
Turnkey CAD & BIM Coordination
We do not deliver off-the-shelf guesswork. Our dedicated facade engineering team generates free 2D shop drawings, BIM families, structural deflection calculations, and custom anchorage details for your architects.
Rapid Haiphong & Hanoi Logistics
Operating in the shared GMT+8/GMT+7 economic belt with direct ocean freight lines connecting Nansha/Shekou to Hai Phong Port in just 3 to 5 days, minimizing site lead times and warehousing costs.
Procurement Knowledge Base
Frequently Asked Questions by Importers in Northern Vietnam
Direct technical answers addressing tariff compliance, freight lead times, site water management, and anti-condensation engineering.
Q1: How do your small aluminium windows handle Hanoi’s "Trời Nồm" condensation?
Condensation during "Trời Nồm" is caused by warm, moisture-laden air contacting cold indoor profiles. Our systems utilize extruded multi-cavity polyamide PA66 thermal breaks that completely isolate exterior metal temperatures from the interior living space. Paired with dual-sealed warm edge spacers and argon-filled insulated glass units, internal frame surfaces remain consistently above the ambient dew point, completely eliminating condensation and mold formation.
Q2: What are the lead times and shipping routes from Foshan to Hanoi construction sites?
Production typically requires 15 to 25 business days depending on surface finish (anodized, powder coated, or PVDF) and structural hardware specs. Finished windows are securely packed in moisture-barrier wrap, corner guards, and fumigated steel-reinforced plywood crates. Ocean transport from South China ports (Nansha/Shekou) to Hai Phong Port takes only 3 to 5 days. From Hai Phong, customs clearance and trucking to central Hanoi take 24 to 48 hours.
Q3: Can you supply Form E Certificate of Origin for preferential import duties into Vietnam?
Yes. Under the ASEAN–China Free Trade Agreement (ACFTA), we routinely provide authentic Form E Certificates of Origin. This documentation enables Vietnamese developers and commercial importers to benefit from 0% or significantly reduced import tariffs on aluminium building products and hardware accessories entering Vietnamese customs gates.
Q4: How is typhoon-level water tightness ensured on small awning and casement windows?
Water infiltration under wind pressure is prevented through three distinct engineering barriers: (1) tiered pressure-equalized decompression chambers with concealed drainage slots, (2) triple-perimeter continuous EPDM rubber weatherstripping, and (3) precision multi-point locking mechanisms by Siegenia or CMECH that clamp the operable sash evenly against the subframe at a minimum of 4 points.
Q5: What glass configurations do you recommend for noise reduction along major Hanoi avenues?
For buildings situated along busy routes like Ring Road 3 or the Cát Linh-Hà Đông metro line, we advise against standard single-pane tempered glass. We engineer small window units with asymmetric acoustic laminated double glazing: 6mm outer low-iron tempered + 12mm 90% Argon gas spacer + (5mm clear + 0.76mm acoustic PVB + 5mm clear) interior pane. This configuration breaks acoustic standing waves, bringing interior ambient noise down to a comfortable 35 dB.
Q6: Can DERCHI customize odd-sized openings for historic villa restorations in Hoàn Kiếm?
Every single unit is fabricated strictly to architectural shop drawings. Our project engineers evaluate existing structural masonry, plumb lines, and wall cavities to manufacture bespoke replacement frames that fit millimetre-accurate openings without requiring costly concrete demolition or facade modification.