Juniper MX2020 Hardware Manual page 170

For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow
at least 36 in. (91.44 cm) of clearance between front-to-rear-cooled routers. Allow 2.8 in. (7 cm) between
the side of the chassis and any non-heat-producing surface such as a wall.
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 36 in. (91.44 cm) in front of the router and 36 in. (91.44 cm)
behind the router.
The rack or cabinet must have an adequate supply of cooling air.
Ensure that the cabinet allows the chassis hot exhaust air to exit from the cabinet without recirculating
into the router.
The router must have the front and rear shipping covers installed to help move the router into the rack
or cabinet.
The router must be installed into a rack or cabinet that is secured to the building structure.
Ensure that there is adequate turn radius and aisle space for the router to be installed into a rack or
cabinet using a pallet jack with attachment.
Ensure that there is adequate turn radius and aisle space for the router to be installed into a rack or
cabinet using a router transport kit.
The cabinet must be clear of any hardware, device, rack, or cabinet component that obstructs the 45 U
rack space from being access during installation.
NOTE: There must be a minimum of 45-U of usable rack space when installing the MX2020
router into a 45-U rack.
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