EPA 608 Type III · Safety · Medium
R-123 is rated B1 under ASHRAE 34. What does that mean?
Answer: A. Higher toxicity, no flame propagation.
- AHigher toxicity, no flame propagation.✓ Correct
- BLower toxicity, mildly flammable.
- CHigher toxicity, highly flammable.
- DLower toxicity, no flame propagation.
Why A is right
The letter rates toxicity (B is higher) and the number rates flammability (1 means no flame propagation). R-123's higher toxicity is why its machinery rooms need refrigerant detectors and careful exposure control.
More Type III questions
- At what pressure does the rupture disc on a low-pressure centrifugal chiller typically burst?
- How is the rupture disc piped to safely vent refrigerant?
- Which HCFO refrigerant is replacing R-123 in new low-pressure chillers?
- A chiller with a 1,000-lb full charge needs 50 lbs added, 73 days after the last addition. What is its annualized leak rate?
- Under EPA's definition, a low-pressure appliance uses a refrigerant with what saturation pressure at 104°F?
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.