Chassis SC743 User's Manual
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System Cooling
Three 8-cm fans located in the center of the chassis provide cooling airow while two 8-cm
exhaust fans at the rear of the chassis expel hot air. (The -SQ models have two 8-cm fans
and one 9-cm fan.) The chassis is also tted with an air shroud to concentrate the ow of
cooling air over the areas of highest generated heat. The fans should all be connected to
headers on the motherboard. Each power supply module also has a cooling fan.
Chassis Fans
Under normal operation, all three chassis fans and both exhaust fans run continuously. They
can be replaced without powering down the system (hot-swap).
Replacing Chassis Cooling Fans
1. Depress the locking tab on the failed fan.
• On a mid-chassis fan, push the tab on the side of the housing inward.
• On an exhaust fan, push down on the colored tab.
2. With the tab depressed, pull the unit straight out.
3. Replace the failed fan, noting the air ow direction. It should click into place. Check that
the fan is working before replacing the chassis cover.
Figure 3-14. Removing a Chassis Fan
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