Fans in power generation plants, such as CHP plants, wind energy or biogas plants have to perform a large number of different tasks: From small fans for cooling machines or workrooms, to the removal of heat loss for recovery, and large special fans for cooling power plants. Fans in offshore power plants or near the coast have to withstand salty sea air, while in cooling towers, generator rooms or transformers, fans are exposed to heat and cold, dust, dirt and vibrations. Often, these not only work under the toughest conditions, but also in continuous operation. This means they need to be robustly built and protected in the right way to be fail-safe and last a long time.