A fan holder used to secure a fan to a heat dissipation device, includes a main body for mounting the fan thereon, a pair of blocking wings and a pair of baffle walls extending from the main body to define a space for receiving the fan therein. The gear system includes a carrier, a gear defining a central axis, and a pin extending along the central axis and coupling the gear to the carrier. The nodes physically enable second backplane links that are in a condition to communicate the data packets to the second switch. The lumens of the catheter circulate a coolant and communicate at the distal heat transfer element for transfer of heat from the cerebrospinal fluid.