What are the operating temperature limits for the HP Z420 Workstation?

The operating temperature range is 5°C to 35°C (40°F to 95°F). However, the upper limit of 35°C is only valid up to 1,524 m (5,000 ft) elevation, and must be derated by 1°C for every 305 m (1,000 ft) above that altitude. For non-operating conditions, the temperature range is -40°C to 60°C (-40°F to 140°F). (Page 13)