EPA Section 608 Universal Exam Predictor | High-
Yield Practice QUESTIONs, Most Frequently Tested
Topics & Detailed Rationales 2026/2027
QUESTION 1 According to ASHRAE Standard 34, what do letter
classifications such as "A" and "B" represent regarding refrigerant
safety?
A. Toxicity level (A for lower toxicity, B for higher toxicity)
B. Flammability level only
C. Operating pressure rating
D. Ozone Depletion Potential category
Correct Answer: A. Toxicity level (A for lower toxicity, B for higher
toxicity)
Detailed Rationale: ASHRAE Standard 34 classifies refrigerants using a
letter for toxicity (A for lower chronic toxicity, B for higher toxicity) and a
number for flammability.
QUESTION 2 According to ASHRAE Standard 34, what does a
flammability classification rating of "1" designate?
A. Higher flammability with rapid flame propagation
B. Lower flammability with a burning velocity under 10 cm/s
C. No flame propagation tested under standard test conditions (non-
flammable)
D. Extremely toxic and unstable gas
,Correct Answer: C. No flame propagation tested under standard test
conditions (non-flammable)
Detailed Rationale: The number 1 is assigned to refrigerants that do not
show flame propagation when tested under standard ASTM standards,
denoting non-flammability.
QUESTION 3 What does the ASHRAE safety group classification "2L"
indicate for certain modern refrigerants?
A. Non-toxic and completely non-flammable
B. Lower flammability with a maximum burning velocity of 10 cm/s or
lower
C. Highly explosive under normal room conditions
D. High toxicity with zero pressure limits
Correct Answer: B. Lower flammability with a maximum burning
velocity of 10 cm/s or lower
Detailed Rationale:* The 2L sub-classification was introduced for mildy
flammable refrigerants (such as certain HFOs) that have a slow burning
velocity and low heat of combustion.
QUESTION 4 What is the standard time horizon used by the EPA and
IPCC when calculating Global Warming Potential (GWP) values?
A. 10 years
B. 50 years
C. 100 years
D. 500 years
,Correct Answer: C. 100 years
Detailed Rationale: GWP ratings evaluate the radiative forcing impact
of a greenhouse gas relative to carbon dioxide over a standard 100-year
time frame.
QUESTION 5 What is the legal definition of "reclaiming" refrigerant
under EPA Section 608 guidelines?
A. Pouring the refrigerant through a basic kitchen strainer
B. Processing recovered refrigerant to new-product specifications (ARI-
700) through chemical analysis
C. Storing used gas in an unlabelled container for emergency use
D. Mixing old refrigerant with fresh oil to improve viscosity
Correct Answer: B. Processing recovered refrigerant to new-product
specifications (ARI-700) through chemical analysis
Detailed Rationale: Reclaiming requires chemical analysis and
processing to ensure the refrigerant meets strict ARI-700 purity
standards before it can be resold.
QUESTION 6 What is the legal definition of "recycling" refrigerant under
EPA rules?
A. Extracting refrigerant and reducing contaminants using devices like
filter-driers and oil separators, without meeting full chemical purity
standards for resale
B. Converting liquid gas into solid ice
C. Releasing gas outdoors so nature can clean it
D. Burning old refrigerant in an incinerator
, Correct Answer: A. Extracting refrigerant and reducing contaminants
using devices like filter-driers and oil separators, without meeting full
chemical purity standards for resale
Detailed Rationale: Recycling cleans refrigerant through basic field-
usable oil separation and filtration devices, whereas reclaiming requires
laboratory-grade chemical processing.
QUESTION 7 Are appliances containing a full charge of less than 50
pounds of regulated refrigerant subject to the federal mandatory leak
repair thresholds?
A. Yes, all appliances regardless of size must comply with 10% leak
repair limits
B. No, mandatory federal leak repair thresholds and tracking rules apply
only to appliances containing 50 or more pounds of regulated
refrigerant
C. Only if they are located outdoors in commercial buildings
D. Only during the summer months
Correct Answer: B. No, mandatory federal leak repair thresholds and
tracking rules apply only to appliances containing 50 or more pounds of
regulated refrigerant
Detailed Rationale: While intentional venting is illegal for all sizes, the
specific mandatory leak inspection, calculation, and repair triggers
under Section 608 apply only to systems containing 50+ pounds of
refrigerant.
Yield Practice QUESTIONs, Most Frequently Tested
Topics & Detailed Rationales 2026/2027
QUESTION 1 According to ASHRAE Standard 34, what do letter
classifications such as "A" and "B" represent regarding refrigerant
safety?
A. Toxicity level (A for lower toxicity, B for higher toxicity)
B. Flammability level only
C. Operating pressure rating
D. Ozone Depletion Potential category
Correct Answer: A. Toxicity level (A for lower toxicity, B for higher
toxicity)
Detailed Rationale: ASHRAE Standard 34 classifies refrigerants using a
letter for toxicity (A for lower chronic toxicity, B for higher toxicity) and a
number for flammability.
QUESTION 2 According to ASHRAE Standard 34, what does a
flammability classification rating of "1" designate?
A. Higher flammability with rapid flame propagation
B. Lower flammability with a burning velocity under 10 cm/s
C. No flame propagation tested under standard test conditions (non-
flammable)
D. Extremely toxic and unstable gas
,Correct Answer: C. No flame propagation tested under standard test
conditions (non-flammable)
Detailed Rationale: The number 1 is assigned to refrigerants that do not
show flame propagation when tested under standard ASTM standards,
denoting non-flammability.
QUESTION 3 What does the ASHRAE safety group classification "2L"
indicate for certain modern refrigerants?
A. Non-toxic and completely non-flammable
B. Lower flammability with a maximum burning velocity of 10 cm/s or
lower
C. Highly explosive under normal room conditions
D. High toxicity with zero pressure limits
Correct Answer: B. Lower flammability with a maximum burning
velocity of 10 cm/s or lower
Detailed Rationale:* The 2L sub-classification was introduced for mildy
flammable refrigerants (such as certain HFOs) that have a slow burning
velocity and low heat of combustion.
QUESTION 4 What is the standard time horizon used by the EPA and
IPCC when calculating Global Warming Potential (GWP) values?
A. 10 years
B. 50 years
C. 100 years
D. 500 years
,Correct Answer: C. 100 years
Detailed Rationale: GWP ratings evaluate the radiative forcing impact
of a greenhouse gas relative to carbon dioxide over a standard 100-year
time frame.
QUESTION 5 What is the legal definition of "reclaiming" refrigerant
under EPA Section 608 guidelines?
A. Pouring the refrigerant through a basic kitchen strainer
B. Processing recovered refrigerant to new-product specifications (ARI-
700) through chemical analysis
C. Storing used gas in an unlabelled container for emergency use
D. Mixing old refrigerant with fresh oil to improve viscosity
Correct Answer: B. Processing recovered refrigerant to new-product
specifications (ARI-700) through chemical analysis
Detailed Rationale: Reclaiming requires chemical analysis and
processing to ensure the refrigerant meets strict ARI-700 purity
standards before it can be resold.
QUESTION 6 What is the legal definition of "recycling" refrigerant under
EPA rules?
A. Extracting refrigerant and reducing contaminants using devices like
filter-driers and oil separators, without meeting full chemical purity
standards for resale
B. Converting liquid gas into solid ice
C. Releasing gas outdoors so nature can clean it
D. Burning old refrigerant in an incinerator
, Correct Answer: A. Extracting refrigerant and reducing contaminants
using devices like filter-driers and oil separators, without meeting full
chemical purity standards for resale
Detailed Rationale: Recycling cleans refrigerant through basic field-
usable oil separation and filtration devices, whereas reclaiming requires
laboratory-grade chemical processing.
QUESTION 7 Are appliances containing a full charge of less than 50
pounds of regulated refrigerant subject to the federal mandatory leak
repair thresholds?
A. Yes, all appliances regardless of size must comply with 10% leak
repair limits
B. No, mandatory federal leak repair thresholds and tracking rules apply
only to appliances containing 50 or more pounds of regulated
refrigerant
C. Only if they are located outdoors in commercial buildings
D. Only during the summer months
Correct Answer: B. No, mandatory federal leak repair thresholds and
tracking rules apply only to appliances containing 50 or more pounds of
regulated refrigerant
Detailed Rationale: While intentional venting is illegal for all sizes, the
specific mandatory leak inspection, calculation, and repair triggers
under Section 608 apply only to systems containing 50+ pounds of
refrigerant.
