Palo Alto PA-220 Hardware Reference Manual page 9

Install the PA‐220 Firewall
Install the PA‐220 Firewall in a 19" Equipment Rack (Continued)
Step 3 Install the PA‐220 power adapter in the power adapter bracket and secure it with the Velcro strap. (Optional)
Install a second power adapter for redundancy.
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Install the PA‐220 Firewall in a 19" Equipment Rack
PA‐220 Next‐Gen Firewall Hardware Reference • 19