SkillCat EPA 608 Certification Exam 2026 |
Complete Study Guide | Verified Questions,
Answers & Rationales | Universal HVAC
Refrigerant Certification Exam Prep
SkillCat EPA 608 Certification Exam 2026 | Complete Study Guide
DOCUMENT OVERVIEW
• This study guide contains 200 verified multiple-choice questions designed to
simulate the actual EPA 608 Universal HVAC Refrigerant Certification Exam with
comprehensive rationales for each correct answer to reinforce learning and
retention.
• Study by reviewing questions systematically, ensuring you understand the
rationale behind each correct answer before moving forward, and use this material
to identify weak areas requiring additional focus before attempting the official
certification exam.
1) What is the primary purpose of the Clean Air Act Section 608 regulation?
A) To eliminate all refrigerant use in commercial applications
B) To reduce ozone depletion and protect the stratosphere by controlling the
release of refrigerants into the atmosphere
C) To lower refrigerant costs for HVAC contractors
D) To require all refrigeration systems to be converted to propane
E) To establish minimum wage standards for HVAC technicians
✓ CORRECT ANSWER: B
The Clean Air Act Section 608 was established specifically to reduce ozone-depleting
substances (ODS) by preventing the unnecessary release of refrigerants during
servicing, maintenance, and repair of refrigeration and air conditioning systems.
The regulation is not designed to eliminate refrigerant use entirely, reduce costs,
,mandate specific refrigerant types, or establish labor standards—its singular focus
is environmental protection through emission reduction.
2) Which of the following is considered a Class I ozone-depleting substance?
A) HFC-410A
B) CFC-12 (R-12)
C) HFC-134a
D) HFO-1234yf
E) Isobutane
✓ CORRECT ANSWER: B
CFC-12 (R-12) is a chlorofluorocarbon that was one of the primary refrigerants used
before the Montreal Protocol and is classified as a Class I ozone-depleting
substance with an extremely high ozone depletion potential (ODP). HFC-410A, HFC-
134a, and HFO-1234yf are lower or zero ODP refrigerants, while isobutane is a
hydrocarbon with negligible ozone depletion potential.
3) What is the maximum pressure relief valve setting allowed for a system
containing 50 pounds of refrigerant?
A) 200 psig
B) 250 psig
C) 300 psig
D) 350 psig
E) 400 psig
✓ CORRECT ANSWER: C
,According to EPA regulations, systems must have a pressure relief valve set at no
more than 10% above the saturation pressure at 130°F (54°C) or the maximum
system design pressure, whichever is lower. For most common refrigerants, this
equates to approximately 300 psig for standard residential and commercial
systems, ensuring safe operation without exceeding the pressure vessel's design
limits.
4) Which type of refrigerant is most commonly used in modern residential air
conditioning systems?
A) CFC-11
B) HFC-134a
C) HFC-410A
D) HCFC-22 (R-22)
E) CFC-502
✓ CORRECT ANSWER: C
HFC-410A is the primary refrigerant used in modern residential and commercial air
conditioning systems manufactured after the CFC and HCFC phase-outs. It has zero
ozone depletion potential and acceptable global warming potential compared to
older refrigerants. CFC-11, HCFC-22, and CFC-502 are phased-out refrigerants, while
HFC-134a is primarily used in refrigeration applications.
5) When must an EPA 608 certification be obtained?
A) Only when initially starting an HVAC business
B) Before any person can purchase or handle refrigerants for servicing air
conditioning and refrigeration equipment
, C) Only for supervisory personnel in HVAC companies
D) After completing a high school diploma
E) When transitioning from one company to another
✓ CORRECT ANSWER: B
EPA regulations mandate that any person who purchases, handles, or works with
refrigerants for servicing air conditioning and refrigeration systems must hold a
valid EPA 608 certification. This applies to all individuals involved in this work
regardless of their position or when they started their career, and the certification
is tied to the individual, not the employer or company.
6) What is the atmospheric lifetime of CFC-12 once released into the
atmosphere?
A) 5-10 years
B) 25-50 years
C) 100-150 years
D) 300-400 years
E) Over 500 years
✓ CORRECT ANSWER: E
CFC-12 (R-12) has an atmospheric lifetime of over 100 years, with some estimates
ranging up to 500+ years, meaning it persists in the atmosphere for an extremely
long time. This extended atmospheric lifetime is one of the primary reasons CFCs
were phased out—they continue to destroy ozone long after their release, causing
decades or centuries of environmental damage.
7) Which refrigerant has the highest ozone depletion potential?
Complete Study Guide | Verified Questions,
Answers & Rationales | Universal HVAC
Refrigerant Certification Exam Prep
SkillCat EPA 608 Certification Exam 2026 | Complete Study Guide
DOCUMENT OVERVIEW
• This study guide contains 200 verified multiple-choice questions designed to
simulate the actual EPA 608 Universal HVAC Refrigerant Certification Exam with
comprehensive rationales for each correct answer to reinforce learning and
retention.
• Study by reviewing questions systematically, ensuring you understand the
rationale behind each correct answer before moving forward, and use this material
to identify weak areas requiring additional focus before attempting the official
certification exam.
1) What is the primary purpose of the Clean Air Act Section 608 regulation?
A) To eliminate all refrigerant use in commercial applications
B) To reduce ozone depletion and protect the stratosphere by controlling the
release of refrigerants into the atmosphere
C) To lower refrigerant costs for HVAC contractors
D) To require all refrigeration systems to be converted to propane
E) To establish minimum wage standards for HVAC technicians
✓ CORRECT ANSWER: B
The Clean Air Act Section 608 was established specifically to reduce ozone-depleting
substances (ODS) by preventing the unnecessary release of refrigerants during
servicing, maintenance, and repair of refrigeration and air conditioning systems.
The regulation is not designed to eliminate refrigerant use entirely, reduce costs,
,mandate specific refrigerant types, or establish labor standards—its singular focus
is environmental protection through emission reduction.
2) Which of the following is considered a Class I ozone-depleting substance?
A) HFC-410A
B) CFC-12 (R-12)
C) HFC-134a
D) HFO-1234yf
E) Isobutane
✓ CORRECT ANSWER: B
CFC-12 (R-12) is a chlorofluorocarbon that was one of the primary refrigerants used
before the Montreal Protocol and is classified as a Class I ozone-depleting
substance with an extremely high ozone depletion potential (ODP). HFC-410A, HFC-
134a, and HFO-1234yf are lower or zero ODP refrigerants, while isobutane is a
hydrocarbon with negligible ozone depletion potential.
3) What is the maximum pressure relief valve setting allowed for a system
containing 50 pounds of refrigerant?
A) 200 psig
B) 250 psig
C) 300 psig
D) 350 psig
E) 400 psig
✓ CORRECT ANSWER: C
,According to EPA regulations, systems must have a pressure relief valve set at no
more than 10% above the saturation pressure at 130°F (54°C) or the maximum
system design pressure, whichever is lower. For most common refrigerants, this
equates to approximately 300 psig for standard residential and commercial
systems, ensuring safe operation without exceeding the pressure vessel's design
limits.
4) Which type of refrigerant is most commonly used in modern residential air
conditioning systems?
A) CFC-11
B) HFC-134a
C) HFC-410A
D) HCFC-22 (R-22)
E) CFC-502
✓ CORRECT ANSWER: C
HFC-410A is the primary refrigerant used in modern residential and commercial air
conditioning systems manufactured after the CFC and HCFC phase-outs. It has zero
ozone depletion potential and acceptable global warming potential compared to
older refrigerants. CFC-11, HCFC-22, and CFC-502 are phased-out refrigerants, while
HFC-134a is primarily used in refrigeration applications.
5) When must an EPA 608 certification be obtained?
A) Only when initially starting an HVAC business
B) Before any person can purchase or handle refrigerants for servicing air
conditioning and refrigeration equipment
, C) Only for supervisory personnel in HVAC companies
D) After completing a high school diploma
E) When transitioning from one company to another
✓ CORRECT ANSWER: B
EPA regulations mandate that any person who purchases, handles, or works with
refrigerants for servicing air conditioning and refrigeration systems must hold a
valid EPA 608 certification. This applies to all individuals involved in this work
regardless of their position or when they started their career, and the certification
is tied to the individual, not the employer or company.
6) What is the atmospheric lifetime of CFC-12 once released into the
atmosphere?
A) 5-10 years
B) 25-50 years
C) 100-150 years
D) 300-400 years
E) Over 500 years
✓ CORRECT ANSWER: E
CFC-12 (R-12) has an atmospheric lifetime of over 100 years, with some estimates
ranging up to 500+ years, meaning it persists in the atmosphere for an extremely
long time. This extended atmospheric lifetime is one of the primary reasons CFCs
were phased out—they continue to destroy ozone long after their release, causing
decades or centuries of environmental damage.
7) Which refrigerant has the highest ozone depletion potential?
