System Housing2-292.6 Installing and Removing a Hot-swappableRedundant Housing FanFour housing fans are distributed inside the housing to cool down thesystem. They are hot-swappable and redundant. You can simplytake one out and put a new one in if a fan fails to operate. You don’teven have to shut down the system.To change a rear hot-swap housing fan:1. Turn the screw knob counterclockwise to open the housing fancage.