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EPA 608 NEC 2023

EPA 608 Type II & III Practice Test 8

This test covers the shift from R-410A to lower-GWP R-32 and R-454B refrigerants under the AIM Act, and the added ventilation, leak-detection, and hot-work precautions needed for mildly flammable A2L refrigerants.

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The EPA 608 certification is required by law for any technician who purchases or handles refrigerants. It covers safe handling, leak detection, recovery, and environmental regulations.

Type I covers small appliances (≤5 lbs refrigerant), Type II covers high-pressure systems, Type III covers low-pressure systems, and Universal covers all three. Most HVAC technicians pursue Universal certification.

You must score at least 70% on each section of the exam. The Universal exam has four parts: core, Type I, Type II, and Type III.

Type II & III Exam Tip: R-32 and R-454B are A2L, mildly flammable refrigerants. They need different ventilation and leak-detection sensitivity than nonflammable R-410A.

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EPA 608 Type II & III Practice Test 8 — Question List

Question 1: Under the AIM Act, R-410A is being phased down in favor of which lower-GWP refrigerants?

R-32 and R-454B
R-22 and R-12
R-500 and R-502
CO2 and ammonia only

Question 2: What does the letter classification A2L mean for a refrigerant?

Nonflammable, high toxicity
Mildly flammable, lower toxicity
Highly flammable, high toxicity
Nonflammable, low toxicity

Question 3: R-410A is classified as which safety group?

A2L, mildly flammable
A1, nonflammable
B2, toxic and flammable
A3, highly flammable

Question 4: A technician is installing a new split system that uses R-32 instead of the R-410A used in the old unit. What extra precaution should the technician take that was not needed with R-410A?

None, R-32 is handled identically to R-410A
Extra care because R-32 is highly toxic
Extra care because R-32 requires deeper vacuum levels than R-410A
Extra care with ventilation, leak detection sensitivity, and hot-work precautions because R-32 is mildly flammable, A2L

Question 5: True or False: R-454B is a nonflammable A1 refrigerant, just like R-410A.

False
True
True, but only in small charges
False, it is highly flammable A3

Question 6: Why does hot work, such as brazing, need extra precautions when servicing an A2L refrigerant system compared to an A1 system?

A2L refrigerants are always colder
A2L refrigerants are mildly flammable, so heat sources need more careful handling to avoid ignition risk
A2L refrigerants freeze brazing rods
There is no real difference in precautions needed

Question 7: Which refrigerant classification applies to R-410A?

A2L
A3
A1
B1

Question 8: What does the AIM Act primarily aim to reduce the use of?

Low-GWP refrigerants
All refrigerants entirely
Only CFC refrigerants
High-GWP refrigerants like R-410A, in favor of lower-GWP alternatives

Question 9: A technician is called to service a rooftop unit but is unsure whether it uses R-410A or a newer A2L refrigerant. Why does this matter before starting work?

It does not matter, all refrigerants are handled the same way
It only matters for billing purposes
A2L refrigerants require different ventilation, leak detection sensitivity, and hot-work precautions than nonflammable A1 refrigerants, so identifying the refrigerant matters for safety
It only matters for evacuation levels

Question 10: True or False: A2L refrigerants require more sensitive leak detection equipment compared to standard A1 refrigerant leak detection.

True
False
True, but only for R-410A
False, leak detection needs are identical

Question 11: Which of these is an example of equipment that might use R-32 or R-454B instead of R-410A?

A large low-pressure chiller only
Only industrial ammonia systems
Only vehicles
A residential split system or heat pump

Question 12: A technician working on an R-454B system notices a small leak indoors. Why is proper ventilation especially important here compared to an R-410A leak?

R-454B is heavier than air and always dangerous regardless of ventilation
R-454B is toxic to breathe in any amount
R-454B is mildly flammable, so keeping the concentration from building up in an enclosed space reduces ignition risk
Ventilation does not matter for either refrigerant

Question 13: A technician is deciding whether extra flammability precautions are needed for a job. Which refrigerant would require them?

R-32
R-410A
R-22
R-11

Question 14: True or False: The shift from R-410A to R-32 and R-454B is driven by the AIM Act's push to lower the global warming potential of refrigerants used in Type II equipment.

False
True, but only for chillers
False, the shift is unrelated to global warming potential
True

Question 15: What safety category number indicates a refrigerant is nonflammable?

2L
3
1
There is no number for this

Question 16: A technician trained only on R-410A systems is assigned to a job with an A2L refrigerant for the first time. What is the most important first step?

Learn the specific ventilation, leak detection, and hot-work precautions required for mildly flammable refrigerants before starting
Treat it exactly like R-410A with no changes
Refuse all A2L jobs permanently
Only use soap bubbles for leak detection

Question 17: True or False: R-32 and R-454B are both classified as A2L refrigerants.

True
False
True, but R-32 is A1
False, both are A3

Question 18: Does the shift from R-410A to A2L refrigerants like R-32 directly affect large low-pressure Type III chillers, which typically use different refrigerants?

Yes, all chillers must immediately switch to R-32
Not directly; the R-410A to R-32/R-454B shift is mainly relevant to Type II equipment like split systems, heat pumps, and rooftop units, though the broader industry trend toward lower-GWP refrigerants affects equipment across the industry
Yes, because chillers and split systems always use identical refrigerants
No, refrigerant choice never changes for any equipment

Question 19: Which refrigerant classification describes both lower toxicity and mild flammability?

A2L
A1
B1
B3

Question 20: A technician needs to select a leak detector for a job on an R-32 split system. What should they consider compared to working on an older R-410A system?

No difference is needed in the detector
A detector that only works on nonflammable refrigerants
There is no such thing as an R-32-specific consideration
A detector suited to the increased sensitivity needs of a mildly flammable refrigerant

Question 21: True or False: All refrigerants replacing R-410A under the AIM Act phase-down are nonflammable.

True
False
True, only in the U.S.
False, but only R-454B is flammable

Question 22: A building owner asks why their new heat pump installation requires different safety signage and ventilation planning than their old one did. What is the most likely explanation?

The installer made a mistake
New heat pumps never need any safety planning
The new heat pump likely uses a mildly flammable A2L refrigerant such as R-32 or R-454B, which requires different precautions than the old nonflammable R-410A system
It is unrelated to refrigerant type

Question 23: Which of these best describes why the industry is moving away from R-410A?

R-410A stopped working effectively
R-410A was banned decades ago
R-410A is being phased down for lower-GWP alternatives under the AIM Act
R-410A is more expensive to manufacture than any alternative

Question 24: True or False: A2L refrigerants are considered highly flammable, similar to propane.

True
True, but only above 90 degrees F
False, A2L refrigerants are nonflammable
False, A2L refrigerants are only mildly flammable

Question 25: Which statement best summarizes the R-410A to R-32/R-454B transition?

It is a simple one-to-one swap with no procedure changes
It moves the industry to lower-GWP refrigerants that are mildly flammable, A2L, requiring different ventilation, leak-detection sensitivity, and hot-work precautions than nonflammable R-410A
It only affects Type III chillers
It eliminates the need for leak detection entirely

Study Tip: The EPA 608 exam is closed book. Memorize: recovery is required before opening any refrigerant system. Venting refrigerant is illegal. Know the ODP and GWP values for R-22, R-410A, R-134a, R-32, and R-454B.

EXAM CARD EPA 608

Questions25

Time limit25 min

Pass score70%

RegulationEPA Section 608

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: EPA Section 608 (40 CFR Part 82)