Brushless DC fans are a relatively new type of fan, they are driven by the principle of electromagnetic induction and offer a number of advantages over traditional carbon brush DC fans.

For starters, brushless DC fans are more stable in operation because they don't have the problem of carbon brushes wearing out. This means they can run continuously for long periods of time and are less prone to failure.

Secondly, brushless DC fans are much quieter. They use DC brushless motors and have a natural air mode, which is quieter and more energy-efficient, and can simulate natural air with a maximum air distance of up to 14 meters.

In addition, brushless DC fans consume less energy. They use a pulse generator with Hall elements, which has the advantages of high anti-interference ability and no electromagnetic interference, so they can save energy during operation.

Finally, brushless DC fans are easier to maintain. They usually have a removable design for easy cleaning and maintenance.

Overall, brushless DC fans are cost-effective and high quality, but they do not have a built-in battery, which makes them a very practical type of fan.