Computer cooling components Juniper

M10i Fan Tray, Spare The fan trays installed along each side of the chassis draw room air into the chassis to maintain an acceptable operating temperature for the Routing Engine, PICs, CFEB or CFEB-E, and other components. The router's cooling system consists of two fan trays, located along the left and right side of the chassis, that provide side-to-side cooling. They connect directly to the router midplane. Each fan tray is a single unit containing eight individually fault-tolerant fans. If a single fan fails, the remaining fans continue to function indefinitely. For proper airflow, the primary fan tray should be installed in slot 1 (the left slot looking at the chassis from the rear) and must be installed for proper cooling at all times. The redundant fan tray, if present, should be installed in slot 0 on the right. This fan tray provides additional cooling and redundancy.