Figure 21: M120 Chassis Dimensions And Clearance Requirements - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide
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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 30 in. (76.2 cm) both
in front of and behind the router.
Airflow vents provided along the sides of the chassis must remain open and uncovered
for proper cooling.

Figure 21: M120 Chassis Dimensions and Clearance Requirements

M120 Rack Mounting Requirements on page 39
Installing the Mounting Hardware for a Center-Mount Open-Frame Rack on page 53
Installing the Mounting Hardware for a Front-Mount Four-Post Rack or Cabinet on
page 49
Installing the Mounting Hardware for a Front-Mount Open-Frame Rack on page 51
Installation Safety Warnings for M Series, MX Series, and T Series Routers on page 195
Installing the M120 Router Without Using a Mechanical Lift on page 69
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