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Description:
Withstands extreme heat up to 435°C, non-flammable, effectively prevents flame spread
Multi-layer pure aluminum construction, elastic, durable, and resistant to deformation or collapse
Stable operation at pressure >2500Pa, supports strong airflow
Meets ASTM D635 and UL 94 fire standards, safe for fire-protection (PCCC) systems
Flexible bending in tight spaces without distortion
Versatile applications: HVAC systems, smoke extraction, boilers, factories, basements
Easy installation, low maintenance, long service life up to 10 years
Parameter:
| Product code | OMCC |
| Duct Diameter Range | D100mm – D400mm |
| Flame Spread Resistance | ASTM D635 ; UL 94 |
| Bending Radius | 0.54*D (mm) |
| Operating Temperature Range | -30°C to 435°C (ASTM D4591) |
| Maximum Air Velocity | 30 m/s |
| Working Pressure | > 2500 Pa ; t = 2h |
| Tensile Strength (D100 duct) | 22 N/cm² – ASTM D774 (*) |
| Standard Length | 3 m/duct |
The duct is manufactured from multiple layers of pure aluminum, typically 2–3 layers or more depending on size. Using pure aluminum enhances oxidation resistance, improves heat tolerance, and prevents cracking, corrosion, or aging during continuous operation in high-temperature environments. Aluminum is also non-combustible, ensuring fire safety in compliance with international standards.
The most distinctive feature is the uniform 9-corrugation structure running along the entire duct length. This design provides:
Increased elasticity, allowing easy extension and compression during installation
Reduced risk of kinking or deformation when bending
Maintains stable shape despite sudden temperature or pressure changes
Corrugated ribs help reduce noise and vibration during high-speed airflow
The rigid fire-resistant aluminum flexible duct is compatible with round, oval, and rectangular connections. Thanks to its high elasticity, the duct can be connected directly without transition fittings such as reducers, elbows, or gaskets, reducing installation time and cost significantly.
Among various duct types available on the market, rigid aluminum fire-resistant flexible duct stands out thanks to its strong technical performance and versatile applications.
One of the most outstanding advantages is its ability to withstand temperatures up to 435°C (tested according to ASTM D4591). This ensures stable operation in environments such as:
Hot air extraction in industrial kitchens
Smoke exhaust in basements and commercial centers
Hot air transfer in boiler systems
High heat resistance is a critical factor for fire and explosion safety, especially in projects requiring strict fire protection standards.
The product meets two major fire safety standards:
ASTM D635: Flame spread rate test on material surface
UL 94: Self-extinguishing capability when exposed to flame
This confirms that the duct is non-flammable, helping prevent flame spread during electrical faults or sudden temperature increases.
With a flexible bending radius of only 0.54 × D, the duct can be easily installed in narrow, confined, or complex spaces. No need for elbows or reducers, reducing accessory and labor costs.
The rigid structure also prevents collapse when bent, ensuring stable airflow without blockage or back pressure.
This duct not only offers excellent specifications but also proves effective in many real-world systems. It is highly rated by MEP engineers for durability and easy installation in various environments.
Commonly used for:
Central air conditioning systems VRV / VRF
Ventilation systems in high-rise buildings and offices
Fresh air supply and light exhaust
Its elasticity reduces vibration and cracking compared to rigid metal ducts, while fire resistance and insulation ensure maximum HVAC safety.
Especially effective in high-temperature smoke environments such as:
BBQ grills in restaurants
Industrial frying systems
Ovens and industrial boilers
Since the duct is non-flammable and does not release toxic gases, it is a safer alternative to plastic or composite ducts.
Boiler systems generate high temperature and pressure, requiring ducts with strong resistance. This duct is ideal because:
Does not collapse under pressure
Maintains airtightness, preventing toxic gas leakage
Long lifespan with minimal maintenance
Also widely used in basements, parking garages, and commercial centers for smoke extraction and forced ventilation systems.
Duct diameter directly affects airflow and pressure. Selection guidelines:
D100 – D150 mm: Household kitchen exhaust, small AC exhaust
D200 – D250 mm: Restaurants, medium exhaust systems
D300 – D400 mm: Large buildings, commercial centers, parking garages
Note: Larger diameter requires larger bending radius, so installation space must be considered.
Ensure the product meets:
Fire resistance: ASTM D635 & UL 94 — Non-flammable, limits flame spread
Working pressure: > 2500 Pa — Stable under strong airflow systems
Tensile strength: ≥ 22 N/cm² — Prevents tearing during installation
Also request CO/CQ (Certificate of Origin & Quality) from suppliers to ensure genuine products meeting technical standards.
Rigid fire-resistant aluminum flexible duct stands out not only for its high heat resistance but also for its elasticity, durability, and ease of installation in various environments. Choosing a product that meets proper technical standards ensures long-term safety and performance of your system. Always verify specifications and purchase from a reliable supplier for the best results.
