In fire protection systems, fire-resistant air ducts (EI) play a vital role in venting smoke and preventing the spread of fire. However, many businesses often have a "install once, use forever" mentality, forgetting that the durability of the air ducts depends heavily on maintenance.
So how often do fire-resistant duct systems need maintenance, and how long do they actually last? Let's find out in detail below.
1. Actual lifespan: How long do fire-resistant ductwork last?
Technically, a standard fire-resistant duct system (made from galvanized steel combined with specialized fire-resistant panels or fire-resistant paint) has an average lifespan of... 20 to 25 years.
However, this lifespan can only be achieved when:
- Materials meet standards: Use fire-resistant panels (such as MgO panels, gypsum boards, or fire-resistant mortar) that offer good heat and moisture resistance.
- Ideal environment: Avoid direct contact with corrosive chemicals or excessively high humidity that could cause the inner steel core to rust.
- Construction carried out according to proper techniques: The flange connections and supports are securely installed, preventing pipe deformation over time.
2. How often does a fire-resistant duct system need maintenance?
Despite their high durability, regular maintenance is mandatory to ensure readiness in the event of a fire. According to recommendations from HVAC experts and fire safety standards, the maintenance schedule should be as follows:
Regular maintenance every 6 months (Surface inspection)
This is a quick check to detect signs of physical deterioration:
- Inspect the fire-resistant coating for any peeling, cracking, or damage.
- Identify any rust spots at the joints, bolts, and nuts.
- Check the tightness of the heat-resistant gaskets at the flange joints.
Intensive maintenance every 12 months (Operating system)
A comprehensive inspection process should be carried out once a year:
- Clean the inside of the pipe: Remove accumulated dirt and debris. Excessive dirt can be a fire hazard or reduce airflow during smoke evacuation.
- Check the fire damper: Ensure that the valve's springs and temperature sensors remain responsive, capable of opening and closing immediately when temperatures rise.
- Reinforce the suspension system: Ensure that the threaded rods and brackets do not become loose due to vibrations from the industrial fan.
3. Why is regular maintenance important for EI ductwork?
Neglecting maintenance not only reduces product lifespan but also creates serious risks:
- Ensuring legal compliance: Modern high-rise buildings and factories are required to undergo periodic inspections by the fire safety authority. Ventilation systems with damaged protective casings will not be accepted for approval.
- Preventing the risk of "disabling": Fire-resistant paint or panels, if affected by mold or peeling, will lose their insulation properties. In the event of a fire, the pipes will deform within minutes instead of withstanding 60-120 minutes as designed.
- Long-term cost savings: Repairing a small section of rusted pipe is always much cheaper than replacing the entire vertical shaft system when it has been severely corroded.
4. Signs that indicate you need immediate duct maintenance.
Don't wait until your scheduled maintenance if you notice the following symptoms in your system:
- There are strange noises, a whistling sound coming from the joints (a sign of air leaks).
- The fire-resistant paint is blistering or the outer covering is damp and rotting.
- The airflow at the vents has decreased unusually.
Conclude
The answer to “"How long do fire-resistant air ducts last?"” The key lies in how you maintain the system. With proper maintenance (every 6-12 months), your system will always be ready to fight fires, providing absolute safety for people and property.
