Dell PowerEdge R810 Getting Started Manual page 16

Environmental
Altitude
Operating
Storage
Airborne Contaminant Level
Class
14
Getting Started With Your System
–16 to 3048 m (–50 to 10,000 ft)
NOTE:
For altitudes above 2950 feet,
the maximum operating temperature
is derated 1ºF/550 ft.
–16 to 10,600 m (–50 to 35,000 ft)
G2 or lower as defined by ISA-S71.04-1985