HVAC - EPA Certification Practice Exam

What ASHRAE classification denotes higher flammability?

1. A2

2. A3

3. B1

4. B2

The correct answer is: A3

The ASHRAE classification system categorizes refrigerants based on their safety characteristics, including flammability. The classification that denotes higher flammability is A3. This class is specifically designated for refrigerants that can easily ignite and pose a significant fire hazard. In the ASHRAE classification, the A2 and A2L classifications refer to refrigerants with lower flammability risk. A2L, for instance, indicates a refrigerant that has a low flammability characteristic, but not as low as A1. Therefore, these classifications are meant to identify refrigerants that have a lower potential for fire hazards compared to those in the A3 category. Classes B1 and B2 relate to refrigerants with toxicity ratings and do not focus on flammability. B1 indicates a refrigerant that has a low toxicity potential, while B2 suggests that the refrigerant has a higher toxicity potential than B1 but does not threaten flammability. Understanding these classifications is crucial for evaluating safety measures in HVAC practices, as it informs technicians about the handling, storage, and application of various refrigerants to ensure safe working conditions.