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NFPA CFPS Exam - Topic 4 Question 14 Discussion

Actual exam question for NFPA's CFPS exam
Question #: 14
Topic #: 4
[All CFPS Questions]

The Safety Class for propane refrigerant R-290 is

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Suggested Answer: B

The safety class for propane refrigerant R-290 is A3, which means it has no toxicity but high flammability. The safety class is determined by the ASHRAE Standard 34, which assigns a capital letter (A or B) for the toxicity level and a number (1, 2, or 3) for the flammability level of a refrigerant. Propane has a very low global warming potential and ozone depletion potential, but it also has a very low flash point and high auto ignition temperature, which make it highly flammable in the presence of ignition sources. Reference: Propane R-290 | Copeland US; R-290 Propane Refrigerant Fact & Info Sheet; Safety Data Sheet - Refrigerants; NFPA Fire Protection Handbook, 21st Edition, Chapter 3, Section 3.3.4.


by Delisa at Aug 03, 2025, 03:47 PM

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Erasmo
4 months ago
Totally agree, A2 is the correct safety class!
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Rebecka
4 months ago
Wait, are you sure it's A2? Seems off.
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Marya
4 months ago
Nope, it's actually A2.
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Milly
4 months ago
I thought it was B1, but A2 makes sense.
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Olene
4 months ago
It's A3, right?
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Oretha
5 months ago
I remember discussing the safety classes, and I think R-290 is A2, but I might mix it up with another refrigerant.
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Micheline
5 months ago
I’m a bit confused. I thought A2 was for mildly flammable refrigerants, but I can't recall if R-290 fits that.
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Elfrieda
5 months ago
I practiced a similar question last week, and I believe R-290 is A3 because it’s highly flammable.
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Loreta
5 months ago
I think R-290 is classified as A2, but I’m not completely sure. I remember something about its flammability.
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Beth
5 months ago
Based on what I know about propane, I think the safety class is A2. Flammable but with lower flammability.
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Beckie
6 months ago
I'm a bit confused on the difference between the safety classes. I'll make sure to double-check the reference material before answering.
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Goldie
6 months ago
Okay, let me think this through. Propane is a hydrocarbon, so it's likely a Class A refrigerant. The question is asking about the safety class, so I'll go with A2.
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Lisha
6 months ago
Hmm, I'm not sure about this one. I'll have to review the safety class definitions again.
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Marg
6 months ago
I'm pretty confident this is A2 since propane is a flammable refrigerant.
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Carissa
8 months ago
B1? More like B.S. if you ask me. I'll take my chances with the good old-fashioned A2 any day.
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Shawnda
7 months ago
I agree, B1 does sound risky. A2 seems like the safer choice.
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Ozell
8 months ago
I think the Safety Class for propane refrigerant R-290 is A2.
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Reta
8 months ago
A3? I'm more of a B2 kind of guy. Gotta keep that propane on the safe side, you know?
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Shaun
7 months ago
I agree, B2 is the way to go to keep propane refrigerant R-290 safe.
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Roy
7 months ago
I think B1 is the best option for the safety class of propane refrigerant R-290.
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Jesse
8 months ago
I prefer A2 for the safety class of propane refrigerant R-290.
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Ashlyn
8 months ago
A2? Sounds like a great safety class for my pet rock's refrigerator. Where do I sign up?
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Pamela
7 months ago
D) B2
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Sabra
7 months ago
C) B1
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Theodora
8 months ago
B) A3
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Ma
8 months ago
A) A2
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