Fire-rated high-temperature smoke exhaust fans handle fire smoke extraction and general supply and exhaust ventilation in high-rise buildings, drying ovens, underground car parks, metro tunnels and similar spaces.
Uses and features
1. Strong high-temperature resistance
The fan meets the test requirements of the GBJ45-82 fire standard. Its internal quality system is set above that standard. It runs continuously for over 100 min at 400°C, and also runs continuously at 100°C. It is used widely in premium civil buildings, ovens, underground car parks and tunnels.
2. Wide range of applications
Depending on the needs of the high-rise building, you can choose a variable-speed or multi-speed drive. This gives one fan two roles: normal ventilation and high-temperature smoke extraction during a fire. It suits ventilation where the medium is hot.
3. High efficiency
The fan is developed with an advanced CAD system and multi-objective optimisation. Measured efficiency exceeds 80%, and exceeds 85% for some sizes. The efficiency curve is flat, which helps save energy.
4. Easy to install, smaller footprint than a centrifugal fan
The basic type is an axial fan. It connects directly to the duct or mounts on a wall. You can fit it vertically (the vertical type has a hood for roof use) or horizontally. This saves floor space. Direct motor coupling keeps it reliable even at large sizes and high airflow.
Performance parameters (using the HTF(A)-I (II) high-temperature fire smoke exhaust fan as an example)
Note: the weight of a two-speed fan refers to the weight of the high-speed version of the same size.
Installation
Correct installation matters for underground smoke extraction. It protects performance and service life. Follow these steps:
1. Inspect every part before fitting. Check that components are complete and all joints are tight.
2. Protect the fan from rain when used in the open.
3. Stop the fan at once and inspect it if you see violent vibration or impact during operation.
4. Clean dust and dirt from inside the fan on a schedule to prevent corrosion.
5. Keep the fan level during installation. Align the joint between the fan and its base and the outlet duct so they meet naturally. Do not force the connection, and never put the weight of the duct on the fan parts.
Selection notes
1. Main control parameters: working temperature, airflow, total pressure, efficiency, noise, motor power, speed and shaft power.
2. The fan must run continuously for long periods when the medium temperature does not exceed 85°C.
3. The fan must work for 30 min at a medium temperature of 280°C, and keep running once the medium cools to ambient.
4. The specific A-weighted sound level at the stated duty point must meet JB/T 8690-1998.
5. You can use a standard steel centrifugal fan or a dedicated smoke-extraction axial fan.
6. Add at least 10% to 20% margin to the required airflow when selecting the fan.
7. Calculate the pressure of the pressurisation fan from the worst loop of the smoke system. Keep the residual pressure in the stairwell at 40–50 Pa. In the front room, shared front room, fire-lift front room and refuge floor it should be 25–30 Pa.
8. The fan must meet the current standard JB/T 10281-2001, Technical Conditions for Fire Smoke Extraction Fans.
Applications
The fan serves fire smoke extraction in all kinds of buildings. It also handles smoke and exhaust in civil defence works, underground railways, mines and tunnels.
It offers strong heat resistance, high efficiency, compact size and easy installation (horizontal, vertical or suspended). It runs for over 30 min at 280°C, and for 20 h per cycle at 100°C without damage. This makes it essential for fire safety.