ASSY TRAY FAN ONIE-FMT PSU/IO

Dell 3HC75-RFB is a refurbished fan tray assembly for the Dell Networking S4048-ON switch. It is designed to move cooling air from the power supply toward the input/output side, helping direct airflow through the system.

The assembly is specified for 12V operation. Its PSU-to-I/O airflow direction is a useful distinction when matching a replacement fan tray to the system’s cooling layout. The listing identifies this part for the S4048-ON, giving it a clear role as a service replacement for that switch.