1. Choose the Ventilator Based on the Physical and Chemical Properties of the Gas

Depending on the characteristics of the gas being conveyed, the appropriate type of ventilator should be selected:

• For explosive or flammable gases, an explosion-proof ventilator should be used, and the required explosion-proof rating must be confirmed.
• For gases containing dust or coal dust, a dust-specific or coal dust-specific ventilator should be selected.
• For corrosive gases, a corrosion-resistant ventilator should be chosen, and suitable corrosion-resistant materials (such as fiberglass or fiberglass-reinforced PP) should be selected according to requirements.
• When operating in high-temperature environments or conveying high-temperature gases, a high-temperature ventilator should be chosen, and the environmental and gas temperature requirements should be understood.

2. Avoid Parallel or Series Operation of Ventilators

When selecting a ventilator, parallel or series operation should be avoided as much as possible, except in unavoidable special situations. When used in series, axial fans of the same model and performance should be selected. Additionally, proper pipeline connections should be made between the first and second-stage fans to ensure system stability and efficiency.

3. Choice of Variety

Before selecting a ventilator, a thorough understanding of the domestic fan production situation should be conducted, including the types, specifications, special uses, and market status of fans. Ensure that the selected fan meets actual application needs and has good product quality in the market.

4. Fan Impeller Selection

When the diameter of the selected fan impeller is significantly larger than the original impeller, the compatibility of the original motor, shaft, bearings, and brackets must be reassessed, and the motor’s startup time and the strength of related components should be calculated. Additionally, the critical speed of the fan shaft should be checked to ensure safe operation of the equipment.

5. Noise Control

For ventilation systems with noise control requirements, a high-efficiency ventilator with a low impeller peripheral speed should be prioritized, and it should operate at its high-efficiency point. Furthermore, based on the noise and vibration propagation characteristics of the system, corresponding noise reduction and vibration control measures should be taken. The vibration isolation foundation generally includes vibration treatment for the fan and motor, and different types of vibration isolation equipment should be selected according to the installation method of the fan.