Juniper Networks ERX Hardware 8 - Manual (Page 153)

Installation Guidelines and Requirements
The distance between the mounting holes in the two posts must be 18.31
inches ±.063 inch, as specified in the EIA-310-D.
Do not use an enclosed rack for ERX-7xx models or the ERX-310 router. It
does not provide adequate ventilation.
A fully loaded rack with three ERX-14xx models must structurally support
300 pounds (136 kilograms).
Optional mounting kits are available for 19-inch and 23-inch rack mounting
(mid-chassis and front-chassis mounting). Contact your Juniper Networks sales
representative for more information.
Space Requirements
If you use an enclosed rack for an ERX-14xx model, ensure that there is
a minimum of 3 inches of clearance between the inner side wall and the
router. This clearance space ensures adequate air flow.
Proper Rack Installation
To confirm proper equipment rack installation, verify the following:
Racks are installed and electrically grounded according to manufacturer
instructions.
Equipment racks are anchored to the floor and, when possible, anchored to
the ceiling as well.
Equipment rack installations comply with applicable local, state, and national
codes.
CAUTION: To maintain airflow requirements, a plenum must be installed above
ERX-14xx models before any other piece of equipment is installed above the router.
Equipment Rack Requirements 135