When selecting a cooling fan, several factors need to be considered: airflow, static pressure, noise level, size, power consumption, and operating environment. Airflow and static pressure are key indicators of a fan's cooling capability, and the appropriate levels should be chosen based on cooling requirements. Noise level is also an important consideration, especially in environments where quiet operation is necessary. Size and power consumption should be selected according to the available space and power supply conditions of the device. Additionally, the operating environment, such as temperature, humidity, and dust, should be taken into account.