EPA 608 Core · Safety · Medium
Which ASHRAE safety classification applies to mildly flammable refrigerants like R-32 and R-454B that are replacing high-GWP HFCs under the AIM Act?
Answer: C. A2L (Mildly flammable)
- AA1 (Non-flammable)
- BB2L (Toxic, mildly flammable)
- CA2L (Mildly flammable)✓ Correct
- DA3 (Highly flammable)
Why C is right
R-32 and R-454B are classified as A2L (mildly flammable). Handling them requires specific ventilation protocols not previously needed for A1 refrigerants. Check your PT Chart for safety classifications.
More Core questions
- Under ASHRAE Standard 34, what does an A2L refrigerant classification indicate?
- Under ASHRAE Standard 34, what does 'A1' signify?
- Under ASHRAE 34, what does the 'B' signify in B2L?
- Why must you never pressurize a system with pure oxygen?
- Which safety device is installed on all DOT recovery cylinders?
Go deeper with the study guide A2L Refrigerants and the R-410A Transition: A Tech’s Guide, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.