ASRHAE refrigerant safety group classification system is based on which two characteristics?

• A. Boiling point and molecular weight
• B. Ozone depletion potential and global warming potential
• C. Pressure and temperature range
• D. Flammability and toxicity

Answer: (D)

The classification is built on two hazards: how toxic the refrigerant is and how flammable it is. Toxicity shows the health risk if someone is exposed to the refrigerant, while flammability shows the fire risk if it’s released and ignited. By combining these two factors, ASHRAE assigns a safety group (for example, low-toxicity nonflammable, or higher-toxicity and more flammable) that tells you how carefully you must handle, ventilate, store, and label equipment and what PPE or precautions are required during service. This focus on health and fire hazards keeps it separate from properties like boiling point or environmental impact.