Juniper Networks M10, M5 manual Clearance Requirements for Airflow and Hardware Maintenance

Router Environmental Tolerances

Clearance Requirements for Airflow and Hardware Maintenance

When planning the installation site, you need to allow sufficient clearance around the rack (see Figure 17):

•For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allowing at least 6 in. (15.2 cm) of clearance between each side of the chassis and adjacent racks or equipment is recommended, particularly for routers in which air flows from side to side through the chassis. Figure 10 depicts the airflow in the M5 and M10 routers.

•For service personnel to remove and install hardware components, there must be adequate space at the front and back of the router. Allow at least 24 in. (61 cm) in front of the router and 19 in. (48.3 cm) behind it.

Figure 17: Chassis Dimensions and Clearance Requirements
	24" (61 cm)		19" (48.3 cm)
		6" (15.2 cm)
	Clearance required		Clearance required
	for maintenance	for airflow	for maintenance

Front of chassis
	17.5"
	44.5 cm

24"	19"	Rear of chassis
(61 cm)
	(48.3 cm)

	6" (15.2 cm)
Mounting ear	for airflow

1303

Router Environmental Tolerances

Table 8 specifies the environmental conditions required for normal router operation. In addition, the site should be as dust-free as possible. Dust can clog air intake vents, reducing cooling system efficiency. Check the vents frequently, cleaning them as necessary. For more information, see “Maintain Hardware Components” on page 75.

Table 8: Router Environmental Tolerances

Description	Tolerance
Altitude	No performance degradation to 10,000 ft (3048 m)
Relative humidity	Normal operation ensured in relative humidity range of 5% to
	90%, noncondensing

40M5 and M10 Internet Routers Hardware Guide