| Rack units and dimensions | - PA-820 firewall
- Rack units—1U
- Dimensions—1.75”H X 14”D X 17.125”W (4.44cm X 35.56cm X 43.49cm)
- PA-850 firewall
- Rack units—1U
- Dimensions—1.75”H X 14.5”D X 17.125”W (4.44cm X 36.83cm X 43.49cm)
The
depth dimension includes hardware that protrudes from the back of
the firewall. The depth of the PA-850 firewall is slightly deeper
due to the power supply handles. | 
