Dell OptiPlex 740 - Manual (Page 72)

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Heat dissipation 955.39 BTU/hr maximum
Voltage manual selection power supplies — 90 to 135 V at
50/60 Hz; 180 to 265 V at 50/60 Hz
Backup battery 3-V CR2032 lithium coin cell
Physical
Height 11.4 cm (4.5 inches)
Width 39.9 cm (15.7 inches)
Depth 35.3 cm (13.9 inches)
Weight 10.4 kg (23 lb)
Environmental
Temperature:
Operating 10° to 35°C (50° to 95°F)
Storage –40° to 65°C (–40° to 149°F)
Relative humidity 20% to 80% (noncondensing)
Maximum vibration:
Operating 0.25 G at 3 to 200 Hz at 0.5 octave/min
Storage 0.5 G at 3 to 200 Hz at 1 octave/min
Maximum shock:
Operating bottom half-sine pulse with a change in velocity of
50.8 cm/sec (20 inches/sec)
Storage 27-G faired square wave with a velocity change of
508 cm/sec (200 inches/sec)
Altitude:
Operating – 15.2 to 3048 m (–50 to 10,000 ft)
Storage – 15.2 to 10,668 m (–50 to 35,000 ft)
Airborne contaminant level G2 or lower as defined by ISA-S71.04-1985