In some embodiments, a rack system is configured to comprise a removable fan system. The fan system enables thermal management of the rack system. The removable fan system includes a replaceable fan tray that can be assembled in the rack system by engaging a connecting mechanism and connecting a connecting cable. The fan tray is engaged with the connecting mechanism to be securely attached to the rack system. The fan tray is connected to a bus bar to receive power or necessary data to be operated. The fan tray can be disassembled from the rack system while the bus remains active, and enables access to the server or the rack system. The replaceable fan tray enables easy replacement of the fan system and access to the rear side of the rack system.