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EPA 608 NEC 2023

EPA 608 Core Practice Test 25

This practice test focuses on the difference between Ozone Depletion Potential (ODP) and Global Warming Potential (GWP), including real reference numbers for common refrigerants, and which law addresses each: the Clean Air Act for ozone, and the AIM Act for climate. It also reviews venting bans, leak rules, and cylinder safety.

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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.

Core Exam Tip: ODP and GWP measure two different problems. A refrigerant can have zero ODP and still have a high GWP, like most HFCs. Do not assume low ODP means low environmental impact overall.

25

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25 min

Time

70%

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EPA 608 Core Practice Test 25 — Question List

Question 1: What does Ozone Depletion Potential (ODP) measure?

How flammable a refrigerant is
How much a substance damages the ozone layer, compared to a reference refrigerant
How much a refrigerant costs per pound
How cold a refrigerant can get

Question 2: What does Global Warming Potential (GWP) measure?

How much ozone a substance destroys
How much a substance weighs in a cylinder
How much a substance contributes to global warming compared to carbon dioxide
How quickly a substance evaporates

Question 3: What determines whether a refrigerant has any ODP at all?

How dense the refrigerant is
How new the refrigerant blend is
Whether it is used in comfort cooling or process refrigeration
Whether it contains chlorine or bromine atoms

Question 4: R-11, a CFC refrigerant, is used as the reference point for ODP, with a value of what?

0.055
2088
675
1.0

Question 5: R-22, an HCFC refrigerant, has approximately what ODP?

1.0
0.055
0 (zero)
1430

Question 6: What is the ODP of common HFC refrigerants such as R-134a and R-410A?

1.0
0.5
0 (zero)
0.055

Question 7: What substance is used as the baseline reference for GWP, with a value of 1?

Nitrogen
Carbon dioxide (CO2)
Chlorine
Ozone

Question 8: R-410A, a common HFC blend, has approximately what GWP?

675
1430
2088
1.0

Question 9: R-134a, commonly used in automotive air conditioning, has approximately what GWP?

2088
0.055
1430
675

Question 10: R-32 is being used in some new equipment as a lower-GWP replacement for R-410A. Approximately what is R-32's GWP, and what safety note goes along with it?

About 2088, and it is nonflammable
About 675, and it is mildly flammable (classified A2L)
About 1.0, and it is highly toxic
About 1430, and it is nonflammable

Question 11: R-744, which is carbon dioxide used as a refrigerant, has what GWP?

2088
1
675
0

Question 12: A refrigerant has an ODP of 0 but a GWP of over 1000. What does this combination tell a technician?

The refrigerant will not harm the ozone layer, but it will contribute meaningfully to global warming if released
The refrigerant is completely harmless in every situation
The refrigerant must actually be a CFC
A high GWP always means a high ODP too

Question 13: Which law and treaty are behind the rules that address ozone-depleting refrigerants like CFCs and HCFCs?

The AIM Act alone
State building codes
The Clean Water Act
The Montreal Protocol, implemented in the US through the Clean Air Act

Question 14: Which law specifically phases down high-GWP HFC refrigerants, addressing climate rather than ozone?

The AIM Act
The Montreal Protocol
Section 608 alone
The Kyoto Protocol

Question 15: How does the AIM Act differ from Section 608 of the Clean Air Act?

The AIM Act targets high-GWP HFC production and import, while Section 608 targets ozone-depleting substances and the venting ban
They are the exact same law with two different names
Section 608 replaced the AIM Act in 2020
The AIM Act only applies to CFC refrigerants

Question 16: Since what date has venting CFC and HCFC refrigerant been illegal?

July 1, 1992
November 15, 1995
January 1, 1990
July 1, 1987

Question 17: Since what date has venting HFC refrigerant been illegal, even though HFCs have an ODP of zero?

July 1, 1992
November 15, 1995
January 1, 2000
It has never been illegal

Question 18: What does "recovery" mean under EPA 608 rules?

Measuring a refrigerant's GWP value
Selling refrigerant to a new owner
Testing a refrigerant's ODP in a lab
Removing refrigerant from a system and storing it in an outside container, with no cleaning

Question 19: What must happen to recovered refrigerant, regardless of its ODP or GWP, before it can be legally sold to a new owner?

Nothing, it can always be resold as-is
It must be diluted with a low-GWP refrigerant
It must be vented and replaced
It must be reclaimed to AHRI Standard 700 purity at a certified facility

Question 20: What yearly leak rate counts as substantial for a comfort cooling appliance with 50 pounds or more of a high-GWP HFC refrigerant?

35%
5%
50%
15%

Question 21: At what purchase amount must a refrigerant sale be documented, regardless of the refrigerant's ODP or GWP?

25 pounds or more
100 pounds or more
2 pounds or more
Only HFC purchases need documentation

Question 22: What color combination is the standard for a recovery cylinder, regardless of the ODP or GWP of the refrigerant inside?

Gray body with a yellow shoulder
All red
Blue body with a black shoulder
All white with no markings

Question 23: What score is needed to pass the Core section of the EPA 608 exam?

50%
84%
70%
90%

Question 24: A single chlorine atom released from a CFC in the stratosphere can destroy roughly how many ozone molecules?

Up to 100,000
Just 1
Exactly 10
An unlimited amount

Question 25: A technician needs to recover a high-GWP HFC refrigerant from a system whose compressor is not running. What type of recovery equipment should be used?

Self-contained recovery equipment
System-dependent recovery equipment
A vacuum pump only
No equipment can recover it

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)