information can also be utilized to determine rotation speed n the temperature information is picked off for this purpose for example at a suitable location on the main circuit board fig1 shows a preferred exemplifying embodiment of a fan 30 for use in a fluid cooling apparatus 10 only fan 30 is depicted without pump 24 fan housing 71 of fan 30 comprises a fluid conduit 100 through which a coolant 52 can be conveyed fluid conduit 100 comprises an inlet 102 and an outlet 104 coolant can flow into fan housing 71 through inlet 102 and flow out through outlet 104 because coolant 52 is being pumped through fan housing 71 on the one hand a further cooling of coolant 52 takes place i e the fan also acts as a heat exchanger and on the other hand fan 30 is effectively protected from overheating for this purpose fluid conduit 100 is preferably additionally routed past the electrical components of stator 76 the fan preferably comprises further fluid conduits in addition to fluid conduit 100 for better heat transfer the fan housing preferably comprises cooling fins that are arranged on the surface of fan 30 and or project into fluid conduit 100 fan housing 71 is preferably made from a thermally conductive plastic this enables better heat transfer between coolant 52 and the fan housing surface at which heat dissipation takes place in a preferred embodiment of the.