Discuss NFPA CFPS Exam Topic 4 Question 14

The Safety Class for propane refrigerant R-290 is

AA2

BA3

CB1.

DB2

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.

Get Premium CFPS Questions as Interactive Web-Based Practice Test or PDF Real Exam Format Detailed Explanations Instant Access Get Your Practice Test

26 comments · newest first

Erasmo 10 months ago

Totally agree, A2 is the correct safety class!

Rebecka 10 months ago

Wait, are you sure it's A2? Seems off.

Marya 10 months ago

Nope, it's actually A2.

Milly 10 months ago

I thought it was B1, but A2 makes sense.

Olene 10 months ago

It's A3, right?

Oretha 11 months ago

I remember discussing the safety classes, and I think R-290 is A2, but I might mix it up with another refrigerant.

Micheline 11 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.

Elfrieda 11 months ago

I practiced a similar question last week, and I believe R-290 is A3 because it’s highly flammable.

Loreta 11 months ago

I think R-290 is classified as A2, but I’m not completely sure. I remember something about its flammability.

Beth 11 months ago

Based on what I know about propane, I think the safety class is A2. Flammable but with lower flammability.

Beckie 12 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.

Goldie 12 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.

Lisha 12 months ago

Hmm, I'm not sure about this one. I'll have to review the safety class definitions again.

Marg 1 year ago

I'm pretty confident this is A2 since propane is a flammable refrigerant.

Carissa 1 year ago

B1? More like B.S. if you ask me. I'll take my chances with the good old-fashioned A2 any day.

Shawnda 1 year ago

↳ replying to Carissa

I agree, B1 does sound risky. A2 seems like the safer choice.

Ozell 1 year ago

I think the Safety Class for propane refrigerant R-290 is A2.

Reta 1 year ago

A3? I'm more of a B2 kind of guy. Gotta keep that propane on the safe side, you know?

Shaun 1 year ago

↳ replying to Reta

I agree, B2 is the way to go to keep propane refrigerant R-290 safe.

Roy 1 year ago

↳ replying to Reta

I think B1 is the best option for the safety class of propane refrigerant R-290.

Jesse 1 year ago

↳ replying to Reta

I prefer A2 for the safety class of propane refrigerant R-290.

Ashlyn 1 year ago

A2? Sounds like a great safety class for my pet rock's refrigerator. Where do I sign up?

Pamela 1 year ago

↳ replying to Ashlyn

D) B2

Sabra 1 year ago

↳ replying to Ashlyn

C) B1

Theodora 1 year ago

↳ replying to Ashlyn

B) A3

Ma 1 year ago

↳ replying to Ashlyn

A) A2

NFPA CFPS Exam - Topic 4 Question 14 Discussion