1. Common application scenarios:

 Computer communication: cooling of host, power supply, and frequency converter.

 Industrial equipment: mechanical control cabinets, power electronics systems, outdoor equipment.

 Household appliances: air purifier, medical equipment, in-vehicle system.

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2. When shopping, consider these points:

 Voltage matching: Ensure that the fan voltage matches the device power supply; otherwise, a converter is required.

 Size appropriate: Measure the installation space and select a fan of the corresponding specification.

 Functional requirements: If silent operation is required, choose ball bearings; if intelligent control is needed, select a speed-adjustable and temperature-controlled model.

 Environmental adaptation: For high humidity and high dust environments, choose a waterproof, dustproof, and weather-resistant fan.