A cost-effective cooling fan should have the following characteristics:

1. Good heat dissipation: the fan should have efficient wind power to quickly reduce the temperature of the equipment and reduce the risk of overheating. Usually, this kind of fan is guaranteed in terms of power and speed, and is made of high-quality materials, such as aluminium alloy fan blades, magnesium alloy fan blades, etc., in order to have high strength, not easy to be deformed, good heat conduction, and high-temperature-resistant characteristics.

2. Quiet and low noise: the fan will not produce excessive noise during operation, which will not affect the user's work and life. Usually, this kind of fan adopts silent design and high quality bearings and wires to reduce friction and vibration.

3. Easy to install and maintain: The fan should be easy to install and maintain for users to replace and clean. Usually, such fans adopt a simple design and easy to dismantle structure for easy maintenance and replacement by the user.

4. Cost-effective: the fan should be cost-effective, able to ensure the cooling effect and quiet noise at the same time, provide a reasonable price. Usually, such fans use high-quality materials and advanced manufacturing processes to reduce costs while providing quality products.

5. Good brand reputation: fans should be selected from well-known brands to ensure product quality and after-sales service. Usually, this kind of fan has a good brand reputation and word of mouth, which can provide users with better protection.

To sum up, a cost-effective cooling fan should be characterised by efficient heat dissipation, quiet noise, easy installation and maintenance, high cost-effectiveness and good brand reputation.