DC computer case fans play a crucial role in maintaining proper airflow within a computer system. When it comes to radiation - protection, these fans are not typically designed with the primary function of shielding against electromagnetic radiation. However, their construction and installation can have an impact on how much radiation is emitted or contained within the computer case.

Most DC computer case fans are made of plastic materials. While plastic itself is not a good conductor of electromagnetic radiation, it does not actively block or absorb it either. The fan blades, usually made of lightweight plastic, rotate at high speeds to move air. During this operation, they do not contribute to the generation of additional radiation but also do not offer significant protection against external radiation sources.

The fan's motor, which is the core component that drives the rotation, is a potential source of electromagnetic interference (EMI). High - quality DC fans are designed with proper insulation around the motor windings. This insulation helps to contain the magnetic fields generated by the motor during operation, reducing the amount of EMI that could potentially leak out of the fan and into the computer system. Additionally, the placement of the fan within the computer case can affect radiation exposure. If the fan is installed in a way that it is close to sensitive components such as the motherboard or hard drive, proper shielding around these components becomes even more important.

In some cases, computer cases may be designed with additional radiation - shielding features. The case itself may be made of metal, which can act as a Faraday cage to block external radiation. The DC fans, when installed within such a case, are then indirectly protected from external radiation sources. However, it's important to note that the overall radiation - protection of a computer system is a combination of multiple factors, and the DC case fan is just one small part of the equation.