Where in the chassis are the internal fans and fan housing located?

In Supermicro systems like the SYS-421GE-TNHR2-LCC, internal fans and their housing are typically located in themiddle of the motherboard tray, providing airflow across CPUs and memory, even in DLC setups where liquid cooling handles primary heat removal. This placement, seen in similar systems (e.g., SYS-420GP-TNAR), balances cooling distribution. A and B (PCIe tray) focus on GPU cooling, not motherboard fans, while C (back of motherboard tray) is less common due to PSU placement. Supermicro’s DLC hybrid designs integrate fans centrally on the motherboard tray, making D correct.References:Supermicro chassis layouts, DLC hybrid cooling configurations.