EPA 608 Type I · Safety · Medium
Under ASHRAE 34, how is Isobutane (R-600a) classified for safety?
Answer: B. A3 (Highly flammable).
- AA1 (Non-flammable).
- BA3 (Highly flammable).✓ Correct
- CA2L (Mildly flammable).
- DB1 (Highly toxic).
Why B is right
Isobutane is classified as A3, meaning it is highly flammable but has lower toxicity.
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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.