Dell Vostro 3650 Owner's Manual page 36

Relative humidity
Altitude:
Operating
Storage
Airborne contaminant level
36
20 % to 80 % (non-condensing)
–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-S71.04–1985