Supermicro SC745 User Manual page 23

3. Make sure the SC745 air shroud is mounted directly on the mainboard of its system
so that the air shroud covers the system mainboard over the CPU's and memory
slots.
NOTE: The air shroud should be mounted flush with the power supply housing
if installing properly. Some cable is supposed to go under the air shroud.
4. Secure the top cover back on your system.
Chapter 3: Configuration and Installation
3-11