Juniper SRX5800 Hardware Manual page 166

For the cooling system to function properly, the airflow around the chassis must be unrestricted.
A minimum of 3 in. (7.62 cm) clearance must be provided behind the power supplies for airflow.
For service personnel to remove and install hardware components, there must be adequate space at the
front and back of the services gateway. At least 24 in. (61 cm) is required both in front of and behind
the services gateway. NEBS GR-63 recommends that you allow at least 30 in. (76.2 cm) behind the
services gateway.
Airflow must always be from front to back with respect to the rack. If the device has side to rear airflow,
then provisions must be made to ensure that fresh air from the front of the rack is supplied to the inlets,
and exhaust exits the rear of the rack. The device must not interfere with the cooling of other systems
in the rack. Fillers must be used as appropriate in the rack to ensure there is no recirculation of heated
exhaust air back to the front of the rack. Care must also be taken around cables to ensure that there is
no leakage of air in situations where recirculation might result.
Figure 82: Chassis Dimensions and Clearance Requirements for the Services Gateway
RELATED DOCUMENTATION
SRX5800 Services Gateway Agency Approvals | 533
SRX5800 Services Gateway General Safety Guidelines and Warnings
SRX5800 Services Gateway Fire Safety Requirements and Fire Suppression Equipment
SRX5800 Services Gateway Definition of Safety Warning Levels
General Electrical Safety Guidelines and Warnings
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