Regardless of ASHRAE refrigerant classification, if there is a refrigerant leak, which hazard should the engineer be aware of?

• A. Fire hazard
• B. Asphyxiation
• C. Corrosion of metal
• D. Electrical shock

Answer: (B)

The main risk from a refrigerant leak in an enclosed or poorly ventilated space is asphyxiation. Many refrigerants are denser than air and can collect in low areas, displacing oxygen and creating an oxygen-deficient environment. Even refrigerants that aren’t acutely toxic can cause dizziness, confusion, or loss of consciousness if the oxygen level drops, so this danger exists regardless of the refrigerant’s classification. While fire, metal corrosion, or electrical shock might appear in some scenarios, they are not the immediate hazard produced by a leak in a confined space; the urgent priority is to ensure ventilation and remove personnel from the area, using detectors and safe leak-control procedures.