/mcp6.4 lb (2.9 kg) 5.9 lb (2.7 kg) 6.4 lb (2.9 kg) 4.6 lb (2.1 kg) 2.2 lb (1 kg) 1.28 lb (0.58kg) Airflow I/O side to bezel side I/O side to bezel side I/O side to bezel side I/O side to bezel side I/O side to bezel side Right I/O side to Left I/O side I/O side to bezel side MTBF (Hours) 480770 480770 512970 566310 587250 593270 593270 Environmental Specifications Operating Conditions Temperature 32 to 104°F (0 to 40°C) 32 to 104°F (0 to 40°C) 32 to 104°F (0 to 40°C) 32 to 104°F (0 to 40°C) 32 to 104°F (0 to 40°C) 32 to 104°F (0 to 40°C) 32 to 104°F (0 to 40°C) Altitude (China) 0 – 6,560 ft. (0 – 2,000 m) 0 – 6,560 ft. (0 – 2,000 m) 0 – 6,560 ft. (0 – 2,000 m) 0 – 6,560 ft. (0 – 2,000 m) 0 – 6,560 ft. (0 – 2,000 m) 0 – 6,560 ft. (0 – 2,000 m) 0 – 6,560 ft. (0 – 2,000 m) Altitude (Rest of the world) 0 – 10,000 ft. (0 – 3,050 m) 0 – 10,000 ft. (0 – 3,050 m) 0 – 10,000 ft. (0 – 3,050 m) 0 – 10,000 ft. (0 – 3,050 m) 0 – 10,000 ft. (0 – 3,050 m) 0 – 10,000 ft. (0 – 3,050 m) 0 – 10,000 ft. (0 – 3,050 m) Short Term Temperature upto 6560ft per NEBS GR-63- CORE NA NA NA NA 32° to 131° (0° to 55° C) (for ISR4331- DC version) NA NA Relative humidity 5% to 85% 5% to 85% 5% to 85% 5% to 85% 5% to 85% 5% to 85% 5% to 85% Short-term humidity 5% to 90%, not to exceed 0.024 kg water/kg of dry air 5% to 90%, not to exceed 0.024 kg water/kg of dry air 5% to 90%, not to exceed 0.024 kg water/kg of dry air 5% to 90%, not to exceed 0.024 kg water/kg of dry air 5% to 90%, not to exceed 0.024 kg water/kg of dry air 5% to 90%, not to exceed 0.024 kg water/kg of dry air 5% to 90%, not to exceed 0.024 kg water/kg of dry air