Some years ago, two young and inexperienced technicians were called to work on a large refrigerant system. The system was not working properly because of an incorrectly installed valve. In their attempt to fix the system, the technicians caused a leak in the piping at the tank, which contained several hundred pounds of refrigerant. Being heavier than air, the refrigerant gas began displacing oxygen in the normal-sized mechanical room. Little did they know—refrigerant cannot be seen or ...

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