Dell Latitude E6220 Owner's Manual page 94

Environmental
Operating
Storage
Altitude (maximum):
Operating
Non-Operating
Airborne contaminant level
94
10 % to 90 % (noncondensing)
5 % to 95 % (noncondensing)
–15.20 m to 3048 m (–50 ft to 10,000 ft)
–15.20 m to 10,668 m (–50 ft to 35,000 ft)
G1 as defined by ISA-71.04–1985