Dell SC400 Owner's Manual page 26

Environmental
Storage
Relative humidity
Operating
Storage
Altitude
Operating
Storage
26
NOTE: For altitudes above 2950 ft, the maximum operating temperature
is derated 1°F per 550 ft.
–40° to 65°C (–40° to 149°F) with a maximum temperature gradation of
20°C per hour
8% to 85% (noncondensing) with a maximum humidity gradation of 10% per
hour
5% to 95% (noncondensing)
–16 to 3048 m (–50 to 10,000 ft)
NOTE: For altitudes above 2950 ft, the maximum operating temperature
is derated 1°F per 550 ft.
–16 to 10,600 m (–50 to 35,000 ft)
SC400/SC420 Expansion Enclosure Technical Specifications