Developer Documentation
PATHHardware Documentation > Original Power Mac G3 Computers Developer Note


Auxiliary Cooling Fans

The Power Macintosh G3 tower enclosure includes a baffle above the PCI card slots for the addition of one or two cooling fans. This feature is provided for VARS or developers that plan to configure the tower enclosure with PCI cards that require additional cooling. Figure 4-1 shows the baffle where the fans can be installed.

Figure 4-1 Location for auxiliary cooling fans

Power for the fans can be obtained from one of the peripheral power connectors, or a Y termination harness can be used if a connector is not available. The fan or fans power consumption must be figured in with the PCI expansion card power budget. The maximum allowable current per fan as +12 V is .2 amps (2.4 watts per fan). The Yellow wire on the peripheral connector provides +12 V and either of the Black wires provides power supply ground.

The baffle is designed to accommodate a 60mm square fan frame with a depth up to 25mm.

VARs and developers installing fans in the enclosure are responsible for routing and securing the wiring properly from the baffle to the power source. The VAR or developer is responsible for safety compliance within the country or countries where the fan configuration of the Power Macintosh G3 tower enclosure will be sold. This includes providing finger guards, testing compliance and agency submittal. If the fan assembly is provided as a kit, the VAR or developer is responsible for the installation instructions and safety compliance.


© 1998 Apple Computer, Inc. - Revised 8/13/98