Juniper Networks manual Hardware Maintenance for an EX8208 Switch on

Chapter 5: Rack and Cabinet Requirements

Table 40: Cabinet Requirements and Specifications for an EX8208 Switch (continued)

Cabinet Requirement	Guidelines for the EX8208 Switch
Cabinet airflow requirements	When you mount the switch on a cabinet, ensure that
	ventilation through the cabinet is sufficient to prevent
	overheating. Consider the following requirements list when
	planning for chassis cooling:
	• Ensure that the cool air supply you provide through the
	cabinet adequately dissipates the thermal output of the
	switch (or switches).
	• Ensure that the cabinet allows the chassis hot exhaust air
	to exit the cabinet without recirculating into the switch. An
	open cabinet (without a top or doors) that employs hot air
	exhaust extraction from the top allows the best airflow
	through the chassis. If the cabinet contains a top or doors,
	perforations in these elements assist with removing the hot
	air exhaust. For an illustration of chassis airflow, see
	“Clearance Requirements for Airflow and Hardware
	Maintenance for an EX8208 Switch” on page 101.
	• The switch fans exhaust hot air through the right side of the
	chassis (the left side when you face the front of the chassis,
	where the fan tray slides in). Install the switch in the cabinet
	in a way that maximizes the open space on the fan tray side
	of the chassis. This maximizes the clearance for critical
	airflow.
	• Route and dress all cables to minimize the blockage of
	airflow to and from the chassis.
	• Ensure that the spacing of rails and adjacent racks allows
	for the proper clearance around the switch and rack as
	specified in “Clearance Requirements for Airflow and
	Hardware Maintenance for an EX8208 Switch” on page 101.

Related Topics • Rack-Mounting and Cabinet-Mounting Warnings for EX Series Switches on page 278

•Rack Requirements for an EX8208 Switch on page 97

•Chassis Physical Specifications of an EX8208 Switch on page 9

ClearanceRequirementsforAirflowandHardwareMaintenanceforanEX8208Switch

When planning the site for installing an EX8208 switch, you must allow sufficient clearance around the switch.

NOTE: To manage airflow in a hot-aisle--cold-aisle data center setup, you might want to use the customized rack solution for EX8200 switches offered by Chatsworth Products, Inc.

•Allow at least 6 in. (15.2 cm) of clearance on each side of the chassis. For the cooling system to function properly, the airflow around the chassis must be unrestricted. See Figure 35 on page 102.

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