A machinery room houses a large R-22 system. During an inspection, it is noted that the continuous mechanical ventilation system is only providing 0.15 L/s per cubic metre of room volume, while CSA B52 requires 0.24 L/s per cubic metre. What is the immediate safety concern regarding this deficiency?

Question: A machinery room houses a large R-22 system. During an inspection, it is noted that the continuous mechanical ventilation system is only providing 0.15 L/s per cubic metre of room volume, while CSA B52 requires 0.24 L/s per cubic metre. What is the immediate safety concern regarding this deficiency?

Answer options:

• Increased energy consumption due to inadequate air changes. ✅ Potential for refrigerant stratification and unsafe concentration levels.
• Premature wear of refrigeration equipment due to poor air circulation.
• Violation of provincial fire code due to insufficient air exchange.

Correct answer: Potential for refrigerant stratification and unsafe concentration levels.

Explanation: The primary safety concern with inadequate ventilation in a machinery room, especially with a heavier-than-air refrigerant like R-22, is the potential for refrigerant to accumulate at low levels, leading to hazardous concentrations and potential asphyxiation or oxygen displacement.