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ITGlossary · UPS technology
Cooling Fan
A built-in fan in UPS or batteries used to dissipate heat during operation.
Technical level:Basic
Inside a UPS, the rectifier, inverter and charger generate heat that must be removed continuously. The fan draws air through the vents and passes it over the heat sinks. On many models its speed increases with load or temperature, which is why a UPS sounds louder when running on battery or at high load.
The fan is one of the few moving parts in a UPS and wears with time. In larger systems, replacing it after a few years of operation is part of preventive maintenance.
Practical tip: leave free space in front of and behind the UPS, do not cover the vents and clean away dust. If the fan noise changes or an overtemperature alarm appears, call a technician before the fault spreads.
Related terms
- AC EfficiencyIndicates how efficiently a UPS converts incoming AC power into usable output power during normal operation.
- AutonomyThe time a battery-powered system (like a UPS) can continue operating critical loads after a power failure.
- DC EfficiencyMeasures how effectively a UPS converts battery power into output power during battery mode.
- MTBFThe average operating time between failures of a device, used as a measure of its reliability.
- Cold Start FunctionA feature that allows a UPS to be started directly from the battery without utility power.
- InverterThe component inside a UPS that converts DC power from batteries back to usable AC power.