Cisco ASR-920-12SZ-IM Hardware Installation Manual page 37

Preparing for Installation
The direction of air flow is from front-to-back.
Figure 5: Air Flow in the Cisco ASR 920 Series Routers
To ensure adequate air flow through the equipment rack, it is recommended that you maintain a minimum
clearance distance as mentioned below, at all times.
• front clearance—12.7 cm
• rear clearance—14 cm
Note the following points:
Cisco ASR-920-12SZ-IM Aggregation Services Router Hardware Installation Guide
Air Flow Guidelines
25