EPA 608 Universal Exam | Actual Exam – All 160
Questions and Correct Detailed Answers with
Rationales | Verified Answers | 2025/2026 Edition
Section 1: Introduction
This document presents the complete and verified set of 160 questions and 100% correct
answers from the EPA 608 Universal Certification Exam, fully updated for the 2025/2026
testing period. It covers all sections of the exam: Core, Type I (Small Appliances), Type II
(High-Pressure Systems), and Type III (Low-Pressure Systems). Each question is paired with
a detailed rationale, making this A+ graded guide the ideal preparation resource for HVAC
technicians seeking Universal EPA 608 certification.
Section 2: Exam Questions and Answers
Core Section
1. What is the primary purpose of the Clean Air Act?
A) To regulate water quality
B) To protect the ozone layer
C) To control industrial emissions
D) To manage waste disposal
B) To protect the ozone layer
Rationale: The Clean Air Act, amended in 1990, includes provisions to phase out
ozone-depleting substances like CFCs, aligning with EPA 608 goals.
2. Which refrigerant is classified as an HCFC?
A) R-134a
B) R-22
C) R-410A
D) R-1234yf
B) R-22
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) with ozone-depleting potential,
being phased out under EPA regulations.
3. What is the maximum allowable leak rate for commercial refrigeration systems?
A) 10%
B) 15%
C) 20%
D) 25%
C) 20%
Rationale: EPA regulations set a 20% annual leak rate threshold for commercial
systems, requiring repairs if exceeded.
4. Which tool is used to check for refrigerant leaks?
A) Manifold gauge set
B) Electronic leak detector
C) Recovery machine
D) Vacuum pump
B) Electronic leak detector
, Rationale: Electronic leak detectors are the most sensitive and reliable for detecting
refrigerant leaks per EPA standards.
5. What is the proper disposal method for used refrigerant?
A) Release into the atmosphere
B) Send to an EPA-certified reclaimer
C) Pour into a drain
D) Store indefinitely
B) Send to an EPA-certified reclaimer
Rationale: EPA requires refrigerants to be reclaimed by certified facilities to prevent
environmental harm.
6. Which regulation governs the handling of refrigerants?
A) OSHA standards
B) Section 608 of the Clean Air Act
C) EPA Title V
D) DOT regulations
B) Section 608 of the Clean Air Act
Rationale: Section 608 specifically addresses refrigerant management, recycling, and
technician certification.
7. What is the ozone depletion potential (ODP) of R-134a?
A) 0.0
B) 0.05
C) 0.1
D) 1.0
A) 0.0
Rationale: R-134a is an HFC with no ozone-depleting potential, making it an
environmentally friendlier alternative.
8. Which personal protective equipment (PPE) is required when handling refrigerants?
A) Safety goggles
B) Steel-toed boots
C) Hard hat
D) Ear protection
A) Safety goggles
Rationale: Safety goggles protect against refrigerant splashes, a key safety
requirement under EPA guidelines.
9. What is the purpose of a recovery cylinder’s yellow top?
A) To indicate nitrogen
B) To indicate recovered refrigerant
C) To indicate new refrigerant
D) To indicate oil
B) To indicate recovered refrigerant
Rationale: The yellow top identifies cylinders containing recovered refrigerant, per
industry color-coding standards.
10. Which gas should never be used to pressurize a system?
A) Nitrogen
B) Oxygen
C) Argon
D) Carbon dioxide
B) Oxygen
Rationale: Oxygen can cause a combustible mixture with refrigerant oil, posing an
explosion risk.
, Type I (Small Appliances)
11. What is the maximum charge size for a Type I appliance?
A) 5 pounds
B) 10 pounds
C) 15 pounds
D) 20 pounds
A) 5 pounds
Rationale: Type I appliances, like small refrigerators, are limited to 5 pounds of
refrigerant to qualify under this certification.
12. Which valve is typically found on a small appliance?
A) Process tube
B) King valve
C) Service valve
D) Schrader valve
A) Process tube
Rationale: Small appliances often use a process tube for refrigerant access, pinched
off after manufacturing.
13. What is the first step in recovering refrigerant from a small appliance?
A) Evacuate the system
B) Check for leaks
C) Connect the recovery device
D) Turn on the recovery unit
C) Connect the recovery device
Rationale: Proper connection ensures safe and efficient refrigerant recovery, the
initial step per EPA guidelines.
14. Which refrigerant is commonly used in small appliances?
A) R-410A
B) R-134a
C) R-22
D) R-123
B) R-134a
Rationale: R-134a is widely used in small appliances due to its non-ozone-depleting
properties.
15. What should be done if a small appliance is unrepairable?
A) Release the refrigerant
B) Recover the refrigerant
C) Dispose of the unit as is
D) Refill with new refrigerant
B) Recover the refrigerant
Rationale: EPA mandates refrigerant recovery from unrepairable units to prevent
release.
16. Which tool is used to pinch off a process tube?
A) Tubing cutter
B) Pinching pliers
C) Flaring tool
D) Torque wrench
B) Pinching pliers
Rationale: Pinching pliers seal the process tube after recovery, a standard practice for
small appliances.
Questions and Correct Detailed Answers with
Rationales | Verified Answers | 2025/2026 Edition
Section 1: Introduction
This document presents the complete and verified set of 160 questions and 100% correct
answers from the EPA 608 Universal Certification Exam, fully updated for the 2025/2026
testing period. It covers all sections of the exam: Core, Type I (Small Appliances), Type II
(High-Pressure Systems), and Type III (Low-Pressure Systems). Each question is paired with
a detailed rationale, making this A+ graded guide the ideal preparation resource for HVAC
technicians seeking Universal EPA 608 certification.
Section 2: Exam Questions and Answers
Core Section
1. What is the primary purpose of the Clean Air Act?
A) To regulate water quality
B) To protect the ozone layer
C) To control industrial emissions
D) To manage waste disposal
B) To protect the ozone layer
Rationale: The Clean Air Act, amended in 1990, includes provisions to phase out
ozone-depleting substances like CFCs, aligning with EPA 608 goals.
2. Which refrigerant is classified as an HCFC?
A) R-134a
B) R-22
C) R-410A
D) R-1234yf
B) R-22
Rationale: R-22 is a hydrochlorofluorocarbon (HCFC) with ozone-depleting potential,
being phased out under EPA regulations.
3. What is the maximum allowable leak rate for commercial refrigeration systems?
A) 10%
B) 15%
C) 20%
D) 25%
C) 20%
Rationale: EPA regulations set a 20% annual leak rate threshold for commercial
systems, requiring repairs if exceeded.
4. Which tool is used to check for refrigerant leaks?
A) Manifold gauge set
B) Electronic leak detector
C) Recovery machine
D) Vacuum pump
B) Electronic leak detector
, Rationale: Electronic leak detectors are the most sensitive and reliable for detecting
refrigerant leaks per EPA standards.
5. What is the proper disposal method for used refrigerant?
A) Release into the atmosphere
B) Send to an EPA-certified reclaimer
C) Pour into a drain
D) Store indefinitely
B) Send to an EPA-certified reclaimer
Rationale: EPA requires refrigerants to be reclaimed by certified facilities to prevent
environmental harm.
6. Which regulation governs the handling of refrigerants?
A) OSHA standards
B) Section 608 of the Clean Air Act
C) EPA Title V
D) DOT regulations
B) Section 608 of the Clean Air Act
Rationale: Section 608 specifically addresses refrigerant management, recycling, and
technician certification.
7. What is the ozone depletion potential (ODP) of R-134a?
A) 0.0
B) 0.05
C) 0.1
D) 1.0
A) 0.0
Rationale: R-134a is an HFC with no ozone-depleting potential, making it an
environmentally friendlier alternative.
8. Which personal protective equipment (PPE) is required when handling refrigerants?
A) Safety goggles
B) Steel-toed boots
C) Hard hat
D) Ear protection
A) Safety goggles
Rationale: Safety goggles protect against refrigerant splashes, a key safety
requirement under EPA guidelines.
9. What is the purpose of a recovery cylinder’s yellow top?
A) To indicate nitrogen
B) To indicate recovered refrigerant
C) To indicate new refrigerant
D) To indicate oil
B) To indicate recovered refrigerant
Rationale: The yellow top identifies cylinders containing recovered refrigerant, per
industry color-coding standards.
10. Which gas should never be used to pressurize a system?
A) Nitrogen
B) Oxygen
C) Argon
D) Carbon dioxide
B) Oxygen
Rationale: Oxygen can cause a combustible mixture with refrigerant oil, posing an
explosion risk.
, Type I (Small Appliances)
11. What is the maximum charge size for a Type I appliance?
A) 5 pounds
B) 10 pounds
C) 15 pounds
D) 20 pounds
A) 5 pounds
Rationale: Type I appliances, like small refrigerators, are limited to 5 pounds of
refrigerant to qualify under this certification.
12. Which valve is typically found on a small appliance?
A) Process tube
B) King valve
C) Service valve
D) Schrader valve
A) Process tube
Rationale: Small appliances often use a process tube for refrigerant access, pinched
off after manufacturing.
13. What is the first step in recovering refrigerant from a small appliance?
A) Evacuate the system
B) Check for leaks
C) Connect the recovery device
D) Turn on the recovery unit
C) Connect the recovery device
Rationale: Proper connection ensures safe and efficient refrigerant recovery, the
initial step per EPA guidelines.
14. Which refrigerant is commonly used in small appliances?
A) R-410A
B) R-134a
C) R-22
D) R-123
B) R-134a
Rationale: R-134a is widely used in small appliances due to its non-ozone-depleting
properties.
15. What should be done if a small appliance is unrepairable?
A) Release the refrigerant
B) Recover the refrigerant
C) Dispose of the unit as is
D) Refill with new refrigerant
B) Recover the refrigerant
Rationale: EPA mandates refrigerant recovery from unrepairable units to prevent
release.
16. Which tool is used to pinch off a process tube?
A) Tubing cutter
B) Pinching pliers
C) Flaring tool
D) Torque wrench
B) Pinching pliers
Rationale: Pinching pliers seal the process tube after recovery, a standard practice for
small appliances.
