- ✅ UL 181 Listed & Labeled – third-party certified by UL Solutions
- ✅ Fire-Resistant & Low Smoke – meets strict fire safety requirements
- ✅ Airtight & Leakage-Controlled – improves HVAC system efficiency
- ✅ Corrosion & Moisture Resistant – suitable for demanding environments
- ✅ Code-Compliant for Global Projects – accepted in U.S., Asia, and international markets
UL181 Class1 HVAC Insulated-Flex R-6” Flexible Ductwork
Description
Summarize
Insulated duct is made by outside sleeve, middle fiberglass insulation layer and inner aluminum duct. All the material are difficult-flammable. So, it anti fire and moisture. From this, the flexible duct delivers excellent performance on both indoor and outdoor working environment. It is used for air ventilator. Therefore, it is widely sold all over the world. Meanwhile, other product like Single Layer Aluminum Flexible Duct, Single Layer Combi PVC Aluminum Flexible Ducting Hose also sell well all over the world.
Anti fire and environmental protection insulated duct
The insulated duct has high fire rating. It meets international requirements. For example, Class A2, European M0/M1 and USA UL listed. As a result, the customer is satisfied with our product. Furthermore, all materials are safe. Hence, there is no toxic with burning.
Temperature and pressure
Insulated pipe standard temperature range is -30℃/+150℃. Likewise, we also design higher specific according to order. The carbon steel wire has high elastic. Consequently, the Insulated duct is strong. Moreover, the duct can bend in any direction. In addition, we have different material to produce this air duct insulation to higher pressure, such as high pressure more than 3000pa.
High quality of insulated duct
Firstly, we use best glue, and our production duct line is industry 3.0. Meanwhile, the other duct manufacturers is industry 2.0. Secondly , the QC inspect raw materials in time. Thirdly, we strictly implement ISO9001:2008. Moreover, our product passed fire testing, pressure testing, and REACH environmental report. In conclusion, we pay high attention to product quality.
Conveniences
Each insulated pipe cut by specified length. Consequently, no need special tools for cutting. In other words, the fiberglass pipe insulation is easy to connect to ducting. Moreover, its compress rate 10:1, easy for transporting.
To sum up, please do not hesitate to contact us if you want to know more about Our Products.
| Product Code | XY-601-B | |||
| Sleeve | Reinforced Aluminum | |||
| Fiberglass | 12kg/50mm,12k/75mm,16k/50mm, | |||
| Inner Duct | Aluminum Duct | |||
| Available Duct Dia. | 50mm-650mm(2″-25″) | |||
| Available Carbon Steel Wire Dia. | 0.6mm-2.5mm | |||
| Length | 10m(Max) | |||
| Fire Resistance | Class A2(Max) | |||
| Compress Ratio | 1:10 | |||
| Temperature Range | -30℃/+150℃ | |||
| Operating Pressure | 2000Pa-3000Pa | |||
| Maximum Air Velocity | 30m/s | |||
| Standard Parameter of QianJing Company | ||||
| Duct Diameter | Steel Wire Dia. (mm) | Steel Wire Spacing (mm) | Carton Size for 25ft(mm) | |
| Inch | mm | |||
| 4″ | 102 | 0.9 | 30 | 200*200*850 |
| 5″ | 125 | 0.9 | 30 | 200*200*850 |
| 6″ | 152 | 1 | 37 | 230*230*850 |
| 6.5″ | 165 | 1 | 37 | 240*240*850 |
| 7″ | 180 | 1.1 | 40 | 260*260*850 |
| 8″ | 203 | 1.1 | 40 | 280*280*850 |
| 10″ | 254 | 1.2 | 45 | 330*330*850 |
| 12″ | 305 | 1.2 | 45 | 380*380*850 |
| 12.5″ | 315 | 1.2 | 45 | 390*390*850 |
| 14″ | 355 | 1.2 | 45 | 430*430*850 |
| 16″ | 405 | 1.2 | 45 | 480*480*850 |
| 18″ | 455 | 1.2 | 45 | 530*530*850 |
| 20″ | 505 | 1.2 | 45 | 580*580*850 |
UL 181 Ducts | UL 181 Certified Air Duct Manufacturer – Shanghai Qianjing
Shanghai Qianjing Ducting Co., Ltd. is a leading UL 181 duct manufacturer in China, supplying UL 181 certified air ducts for commercial, industrial, and institutional HVAC systems worldwide. Our UL 181 ducts are engineered for fire safety, airtight performance, and long-term durability, fully compliant with U.S. and international building codes.
What Is a UL 181 Duct?
A UL 181 duct is a factory-made air duct or connector that has been tested and certified under UL 181 – Standard for Factory-Made Air Ducts and Air Connectors. This certification verifies:
- Flame spread and smoke development compliance
- Structural integrity under positive and negative pressure
- Long-term performance in HVAC and ventilation systems
Specifying UL 181 certified ducting helps contractors, engineers, and building owners reduce compliance risk and accelerate project approvals.
Our UL 181 Duct Product Range
We manufacture a complete line of UL 181 air ducts, including:
- UL 181 Class 0 / Class 1 Flexible Ducts – for low to medium pressure HVAC systems
- UL 181 Rigid Ducts & Air Connectors – for high-integrity air distribution
- UL 181 Listed Insulated Ducts – with thermal and acoustic performance
- Custom UL 181 duct solutions – tailored to project specifications
All products are tested to UL’s latest standards and manufactured under an ISO-based quality management system.
Key Features & Benefits
- ✅ UL 181 Listed & Labeled – third-party certified by UL Solutions
- ✅ Fire-Resistant & Low Smoke – meets strict fire safety requirements
- ✅ Airtight & Leakage-Controlled – improves HVAC system efficiency
- ✅ Corrosion & Moisture Resistant – suitable for demanding environments
- ✅ Code-Compliant for Global Projects – accepted in U.S., Asia, and international markets
Technical Specifications (Overview)
| Parameter | Value / Standard |
|---|---|
| Certification | UL 181 (Class 0 / Class 1 available) |
| Material | Fire-rated aluminum / steel / composite options |
| Operating Pressure | Positive & negative pressure configurations |
| Temperature Range | -30°C to +150°C (custom on request) |
| Length & Diameter | Standard & custom sizes available |
| Compliance | UL, ASHRAE, NFPA, IMC |
For detailed technical data sheets (TDS) and installation guidelines, contact our technical team.
Applications
Our UL 181 certified ducts are widely used in:
- Commercial office buildings
- Hospitals and healthcare facilities
- Airports, stations, and public infrastructure
- Industrial plants and cleanrooms
- Data centers and energy projects
Why Choose Qianjing UL 181 Ducts?
- Proven Certification – Officially awarded UL 181 certificate by UL Solutions (Dec 11, 2025)
- End-to-End Quality Control – from raw material inspection to finished product testing
- Global Supply Capability – export experience across Asia, North America, and beyond
- Engineering Support – duct sizing, layout consultation, and installation guidance
Built on Craftsmanship, Driven by Safety
Guided by our philosophy “Humility Casts Crystal, Pipes Connect the Future,” we treat UL 181 certification not as a finish line, but as a new starting point—to deliver safer, higher-quality ducting solutions and showcase the credibility of Made in China on the global stage.
Get a Quote for UL 181 Ducts
Looking for a reliable UL 181 duct supplier?
Contact Shanghai Qianjing Ducting Co., Ltd. today for product catalogs, technical data, and competitive pricing.
📧 Email: admin@xuanyuanafd.com
🌐 Website: www.ductingxy.com
📞 Phone / WhatsApp:13918360649
