Cisco 4000 Series Hardware Installation Manual page 80

Install the Router
Be sure to leave some space above and below each router in a rack to allow for cooling air circulation.
Caution
Figure 3-4 Bracket Installation for Back Mounting (Cisco 4451-X ISR shown)
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23-inch SBC brackets
Figure 3-5 Bracket Installation for Center-Back Mounting (Cisco 4451-X ISR shown)
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23-inch SBC brackets
Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers
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19-inch EIA brackets
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19-inch EIA brackets
Chapter 3 Install and Connect Cisco 4000 Series ISRs
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