Mitsubishi Elevator Cooling Fan QF-330 / QF-400

QF-330 and QF-400 are cross-flow cooling fans commonly used in Mitsubishi elevator car ventilation systems.

Installed on the top of the elevator car, these fans help maintain air circulation inside the cabin and improve passenger comfort during daily operation.

They are commonly associated with:

• elevator car ventilation
• cabin air circulation
• passenger comfort systems
• car roof ventilation units
• elevator airflow management

Cross-flow fan designs are widely used in elevator applications because they can provide uniform airflow in confined spaces.

Common Field Situation

Passengers often notice ventilation issues before maintenance personnel receive a fault report.

Typical symptoms may include:

• weak airflow inside the cabin
• increased cabin temperature
• abnormal fan noise
• intermittent fan operation
• reduced air circulation during peak traffic hours

In shopping malls, hotels, hospitals, and office towers, cabin ventilation becomes increasingly important when elevators operate continuously throughout the day.

Why Elevator Ventilation Matters

A properly functioning ventilation fan helps improve:

• passenger comfort
• cabin air circulation
• temperature balance
• air freshness
• overall riding experience

Unlike controller-related components, ventilation fans directly affect how passengers feel during elevator travel.

In hot climates and high-traffic buildings, stable airflow can significantly improve cabin comfort during peak operating periods.

System Relationship

The QF-330 and QF-400 fans typically work together with:

• car top ventilation assemblies
• cabin lighting systems
• emergency ventilation circuits
• elevator power supply systems
• air circulation channels

In some elevator models, the fan may continue operating even when the elevator is idle to maintain airflow inside the cabin.

Practical Maintenance Notes

In long-term service environments, technicians may inspect the fan when:

• bearing noise increases
• airflow becomes weaker
• dust accumulates on the blower wheel
• vibration appears during operation

For elevators installed in dusty environments or regions with high temperatures, cleaning the fan assembly can help maintain ventilation efficiency.

FAQ

Why does an elevator feel hot even when it is operating normally?

In some cases, reduced fan performance or blocked airflow may affect cabin ventilation and passenger comfort.

Can a cooling fan cause unusual noise inside the elevator?

Yes. Bearing wear, dust accumulation, or fan imbalance may gradually increase operating noise.

What is the difference between QF-330 and QF-400?

Both are cross-flow elevator ventilation fans, but different models may vary in airflow capacity, installation dimensions, and elevator compatibility.

Installation Notes

Before replacement:

• verify the fan model and dimensions
• check voltage specifications
• inspect mounting brackets
• clean surrounding ventilation channels
• confirm airflow direction after installation

Some Mitsubishi elevator generations use different fan lengths and mounting structures depending on cabin size and ventilation requirements.