Multi unit electrical apparatus with forced air cooling.

摘要

Electrical apparatus is described which may include one or more electrical devices, each being located in a corresponding one of a plurality of device positions defined in a first section of a housing. The system further includes at least one brushless dc motor driven centrifugal fan, and a power supply unit. In operation, the fans provide forced air cooling of the devices and power supply. Each of the devices is selected from a plurality of possible device types, each device type presenting a different impedance to the flow of cooling air.