A recovery cylinder should not be filled past what level?EPA, Section 608 Test Topics, Core: Safety
A refrigeration system has several independent refrigerant circuits. What counts as one "appliance" under Subpart F?40 CFR 82.152, appliance
A technician cuts the line on a heat pump charged with an HFC refrigerant and lets the charge escape. HFCs contain no chlorine. Is that legal?40 CFR 82.154(a)(1)
A technician holds only Section 609 (motor vehicle) certification. Which refrigerant may that person buy?EPA, Refrigerant Sales Restriction
A Universal test, as Appendix D describes it, has how many questions?40 CFR part 82, subpart F, appendix D
A wholesaler's refrigerant invoices must show which details?EPA, Refrigerant Sales Restriction; 40 CFR 82.154(c)
According to EPA's core topic list, which of these affects how fast refrigerant can be recovered?EPA, Section 608 Test Topics, Core: Recovery Techniques
According to EPA, one chlorine atom can destroy how many ozone molecules before it is removed from the stratosphere?EPA, Basic Ozone Layer Science
Ammonia is exempt from the venting prohibition when it is used where?40 CFR 82.154(a)(1)(iv)
Show all 192 questions (183 more)
Core, continued
An apprentice is not yet certified. When may the apprentice work on a refrigerant circuit?40 CFR 82.161(a)(2); 40 CFR 82.152, apprentice
An ozone molecule is made of what?EPA, Basic Ozone Layer Science
At a minimum, how many questions from the core group must every Section 608 certification test include?40 CFR 82.161(c)
Between 2010 and the 2020 cutoff, newly produced or imported R-22 could be used for what?EPA, Phaseout of Class II Ozone-Depleting Substances
Does a Section 608 technician certification expire?EPA, Section 608 Technician Certification Requirements; 40 CFR 82.161(a)(5)
EPA links more UVB reaching the ground with which effects on people?EPA, Basic Ozone Layer Science; Health and Environmental Effects of Ozone Layer Depletion
EPA separates Class I from Class II ozone-depleting substances at what ozone-depletion potential?EPA, Phaseout of Class I and Class II Ozone-Depleting Substances
EPA's glossary puts the ozone-depletion potentials of HCFCs in which range?EPA, Section 608 Test Topics, glossary entries for HCFC, CFC and ODP
EPA's safety topics name which everyday protective gear for handling refrigerant, with a self-contained breathing apparatus kept for extreme cases?EPA, Section 608 Test Topics, Core: Safety
For how long must a technician keep a copy of the certificate?40 CFR 82.161(a)(4)(ii)
How long must a refrigerant seller keep its sales records and the proof of a buyer's certification?40 CFR 82.154(c)
In which layer of the atmosphere is most of the protective ozone found?EPA, Basic Ozone Layer Science
In which year does the U.S. schedule end production and import of every HCFC?EPA, Phaseout of Class II Ozone-Depleting Substances
Ozone-depletion potential (ODP) compares a chemical with which reference substance, whose ODP is set at 1.0?EPA, Section 608 Test Topics, glossary entry for ODP
Propane (R-290) is exempt from the venting prohibition in which situation?40 CFR 82.154(a)(1)(viii)
R-12 belongs to which family of refrigerants?EPA, Section 608 Test Topics, Core: Environmental Impacts
R-134a belongs to which family of refrigerants?EPA, Section 608 Test Topics, Core: Environmental Impacts
R-22 belongs to which family of refrigerants?EPA, Section 608 Test Topics, Core: Environmental Impacts
Reclaimed refrigerant must meet purity specifications based on which standard?40 CFR 82.152, reclaim; 40 CFR 82.164
Recovery and recycling equipment manufactured on or after November 15, 1993 must be what?40 CFR 82.158
Recovery equipment that can remove refrigerant without help from the appliance's own components is called what?40 CFR 82.152, self-contained recovery equipment
Refrigerant has been recovered into a cylinder. What is knowingly releasing it from that cylinder?40 CFR 82.154(a)(3)
Reusable recovery cylinders must be approved by which agency?EPA, Section 608 Test Topics, Core: Safety
Servicing which equipment for pay falls under Section 609 certification (Subpart B) instead of Section 608?40 CFR 82.161(a)(1)(vi)
Since what date has there been no U.S. production or import of HCFC-22 (R-22)?EPA, Phaseout of Class II Ozone-Depleting Substances
System-dependent recovery equipment may not be used on an appliance with a full charge above what size, unless it is permanently attached as a pump-out unit?40 CFR 82.156(e)
System-dependent recovery equipment relies on what to move the refrigerant?40 CFR 82.152, system-dependent recovery equipment
To clean refrigerant for reuse with oil separation and passes through filter-driers, without meeting every reclamation requirement, is to do what?40 CFR 82.152, recycle
To remove refrigerant in any condition from an appliance and store it in an external container, without necessarily testing or processing it, is to do what?40 CFR 82.152, recover
To reprocess recovered refrigerant to the AHRI 700 specifications and verify the result by analysis is to do what?40 CFR 82.152, reclaim
Under 40 CFR 19.4 as it read in September 2026, what is the maximum civil penalty per day for each violation of the Clean Air Act, for penalties assessed on or after January 8, 2025?40 CFR 19.4, Table 1, row for 42 U.S.C. 7413(b), eCFR text dated 2026-09-17
Under the HFC phasedown in 40 CFR 84.7, production and consumption fall to what share of the baseline in 2036 and after?40 CFR 84.7(a)
Used refrigerant may be sold to a new owner for use in an appliance only after what has happened?40 CFR 82.154(d)
What breaks CFC molecules apart in the stratosphere and frees their chlorine?EPA, Section 608 Test Topics, glossary entry for chlorofluorocarbon
What does EPA's core topic list say about "drop-in" replacement refrigerants?EPA, Section 608 Test Topics, Core: Substitute Refrigerants and Oils; 40 CFR 82.152, retrofit
What is fractionation?EPA, Section 608 Test Topics, Core: Substitute Refrigerants and Oils
What is the main environmental concern with HFC refrigerants?EPA, Background on HFCs and the AIM Act
What is the Montreal Protocol?EPA, Section 608 Test Topics, Core: Clean Air Act and Montreal Protocol
What is the passing score on the closed-book, proctored Section 608 tests?40 CFR part 82, subpart F, appendix D
What is the rule for a disposable refrigerant cylinder?EPA, Section 608 Test Topics, Core: Safety
When a nitrogen cylinder is used to pressurize a system, what must be part of the setup?EPA, Section 608 Test Topics, Core: Safety
When did the U.S. ban on producing and importing CFCs take effect?EPA, Phaseout of Class I Ozone-Depleting Substances
Where must a certified technician keep a copy of the certificate?40 CFR 82.161(a)(4)
Which certification covers small appliances, high-pressure equipment and low-pressure equipment together?40 CFR 82.161(a)(1)
Which color code identifies a reusable recovery cylinder?EPA, Section 608 Test Topics, Core: Safety
Which element in CFC and HCFC refrigerants destroys ozone in the stratosphere?EPA, Section 608 Test Topics, Core: Environmental Impacts
Which gas should be used to pressurize a system for leak checking?EPA, Section 608 Test Topics, Core: Safety
Which job counts as "opening an appliance" under Subpart F?40 CFR 82.152, opening an appliance
Which labels does EPA's shipping topic require on refrigerant cylinders?EPA, Section 608 Test Topics, Core: Shipping
Which law, enacted on December 27, 2020, gives EPA authority to phase down HFCs?EPA, Background on HFCs and the AIM Act
Which list runs from the highest ozone-depletion potential to the lowest?EPA, Section 608 Test Topics, Core: Environmental Impacts
Which lubricant does EPA's topic list give as its example for HCFC refrigerants?EPA, Section 608 Test Topics, Core: Substitute Refrigerants and Oils
Which lubricant does EPA's topic list pair with R-134a?EPA, Section 608 Test Topics, Core: Substitute Refrigerants and Oils
Which part of the sun's radiation does the ozone layer absorb, protecting people and crops?EPA, Basic Ozone Layer Science
Which recovery practice is on EPA's core topic list?EPA, Section 608 Test Topics, Core: Recovery Techniques
Which refrigerant container can still be sold to a person with no certification?40 CFR 82.154(c); EPA, Refrigerant Sales Restriction
Which refrigerant is exempt from the venting prohibition in any application?40 CFR 82.154(a)(1)(i)-(iii)
Which release is NOT a violation of the venting prohibition?40 CFR 82.154(a)(2); EPA, Prohibition on Venting Refrigerants
Which set of health risks does EPA's core safety topic name for exposure to refrigerant?EPA, Section 608 Test Topics, Core: Safety
Which step of the HFC phasedown in 40 CFR 84.7 covers the years 2024 through 2028?40 CFR 84.7(a)
Which task is reasonably expected to violate the integrity of the refrigerant circuit, so that the person doing it must be certified?40 CFR 82.152, technician
Which title of the Clean Air Act, as amended in 1990, directs EPA to protect the ozone layer?EPA, Section 608 Test Topics, glossary entry for Clean Air Act
Who may buy a 25-pound cylinder of R-410A for stationary equipment?40 CFR 82.154(c); EPA, Refrigerant Sales Restriction
Why do HFC refrigerants have an ozone-depletion potential of zero?EPA, Section 608 Test Topics, glossary entry for hydrofluorocarbon
Why does chlorine from swimming pools, sea salt and volcanoes not thin the ozone layer?EPA, Basic Ozone Layer Science
Why is a system evacuated at the end of service, before it is charged?EPA, Section 608 Test Topics, Core: Dehydration Evacuation
You recover R-22 from a customer's rooftop unit. Without reclaiming it, where may the refrigerant go?40 CFR 82.156(h); EPA, Service Practice Requirements
Type I: small appliances 30
A freezer arrives at the scrap yard after a collision broke its tubing and the whole charge escaped. What does the final processor need?40 CFR 82.155(b)(2)(iii)
A new household refrigerator is charged with isobutane (R-600a). How does the venting prohibition treat that charge?40 CFR 82.154(a)(1)(ix)
A scrap yard accepts a refrigerator with the charge already recovered. The signed statement it keeps must include what?40 CFR 82.155(b)(2); EPA, Safe Disposal Requirements
A small appliance has a compressor that will not run and you are using a system-dependent (passive) recovery device. Which technique does EPA list?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
A technician removes the refrigerant from a working window unit, repairs it, and puts the same refrigerant back. Did the refrigerant have to be reclaimed first?40 CFR 82.156(h)
A Type I test may be given in which format that is not allowed for Type II or Type III?40 CFR part 82, subpart F, appendix D
Do the Subpart F leak repair rules require the owner of a leaking household refrigerator to repair it within 30 days?40 CFR 82.157(a)
Does a person who only disposes of small appliances need Section 608 certification?40 CFR 82.161(a)(1)(vii); 40 CFR 82.155
How long must a final processor keep its signed statements and contracts on refrigerant recovery?40 CFR 82.155(c)
In the disposal chain for an old refrigerator, who is responsible for making sure the refrigerant was recovered?40 CFR 82.155(b); EPA, Safe Disposal Requirements
Instead of meeting a recovery percentage, a technician may evacuate a small appliance to what vacuum?40 CFR 82.156(b)(3)
Recovery equipment for small appliances that was made on or after November 15, 1993 must be certified to recover what share of the refrigerant when the appliance's compressor is not running?40 CFR 82.158
Type I certification allows a person to do what?40 CFR 82.161(a)(1)(i)
Under Subpart F, a "small appliance" is fully manufactured, charged and hermetically sealed in a factory with how much refrigerant?40 CFR 82.152, small appliance
What can happen to a refrigerant that meets an open flame or a very hot surface?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Safety
What is the passing score on a Type I test taken in the mail-in format?40 CFR part 82, subpart F, appendix D
What must a small appliance have so that refrigerant can be removed at servicing and disposal?40 CFR 82.154(e)
What should be done with solderless (piercing) access fittings when the service is finished?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
When recovering from a small appliance whose compressor does not run, which access valves should be installed?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
Which equipment does EPA list for passive recovery from a small appliance with a dead compressor?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
Which of these is a small appliance under the rule?40 CFR 82.152, small appliance
Which product is named in the small appliance definition?40 CFR 82.152, small appliance
Which refrigerant does EPA name as the likely substitute for R-12 in small appliances?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
Which two readings does EPA say are used to identify a refrigerant and to detect noncondensables?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
Will EPA accept a sticker on a refrigerator as proof that its refrigerant was recovered?EPA, Safe Disposal Requirements
You are using a system-dependent recovery device on a refrigerator whose compressor works. What should the compressor be doing?EPA, Section 608 Test Topics, Type 1 (Small Appliances): Recovery Techniques
You passed the core questions on an open-book, mail-in Type I test. Can that core score count toward Universal certification?40 CFR part 82, subpart F, appendix D; EPA, Section 608 Technician Certification Requirements
Your recovery equipment was made after November 15, 1993 and the freezer's compressor does not run. What share of the refrigerant must you recover?40 CFR 82.156(b)(2)
Your recovery equipment was made after November 15, 1993 and the refrigerator's compressor runs. What share of the refrigerant must you recover?40 CFR 82.156(b)(2)
Your recovery machine was manufactured before November 15, 1993. What share of the refrigerant must you recover from a small appliance?40 CFR 82.156(b)(1)
Type II: high-pressure 56
A comfort cooling appliance with 120 pounds of R-22 exceeded its leak rate. How often must it then get a leak inspection?40 CFR 82.157(g)(1)
A commercial refrigeration appliance with 600 pounds of R-22 exceeded its leak rate. How often must it then get a leak inspection?40 CFR 82.157(g)(1)(i)
A gauge reads 100 psig. What is that in psia?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Refrigeration
A high-pressure appliance uses a refrigerant whose liquid phase saturation pressure at 104 degrees F falls in which range?40 CFR 82.152, high-pressure appliance
A repair on a high-pressure appliance is not major, and the appliance will not be evacuated to the atmosphere afterward. Before it is opened it must be evacuated to no higher than what pressure?40 CFR 82.156(a)(1)(i)
A sight glass check shows a system is short of charge but cannot show where the leak is. How may it be used in a required leak inspection?40 CFR 82.152, leak inspection
A supermarket rack holding 800 pounds of R-22 is commercial refrigeration. Above what leak rate must the owner act?40 CFR 82.157(c)(2)
A technician recovers the charge from a 30-pound rooftop unit that is being scrapped. What record must the technician keep?40 CFR 82.156(a)(3)
An appliance has leaks that make the Table 1 vacuum impossible to reach. What must the technician do?40 CFR 82.156(a)(2)
An appliance is watched by an automatic leak detection system that is audited or calibrated every year. What does that change?40 CFR 82.157(g)(4)
An appliance with 50 pounds or more of refrigerant leaks 125 percent or more of its full charge in one calendar year. What must the owner do?40 CFR 82.157(j)
An MVAC-like appliance has a full charge of no more than how many pounds?40 CFR 82.152, MVAC-like appliance
An MVAC-like appliance, such as the cab air conditioner on a farm tractor, may be serviced by a technician with which certification?40 CFR 82.161(a)(1)(v)
An owner decides to retrofit or retire a leaking appliance rather than repair it. The written plan is due within how many days?40 CFR 82.157(h)
An owner sets the full charge of an appliance as an established range based on the best available data. Which value in the range serves as the full charge?40 CFR 82.152, full charge
An R-134a chiller holds 450 pounds. With recovery equipment made after November 15, 1993, what evacuation level does Table 1 require?40 CFR 82.156(a), Table 1
An R-134a system holds 80 pounds. With recovery equipment made after November 15, 1993, what evacuation level does Table 1 require?40 CFR 82.156(a), Table 1
An R-22 rooftop unit holds 20 pounds. Your recovery machine was made after November 15, 1993. Before a major repair, to what level must you evacuate?40 CFR 82.156(a), Table 1
An R-22 system holds 300 pounds. With recovery equipment made after November 15, 1993, to what level must it be evacuated before it is opened for a major repair?40 CFR 82.156(a), Table 1
As of April 10, 2020, the leak repair section of Subpart F (40 CFR 82.157) applies to which appliances?40 CFR 82.157(a)
Before an oil change, the appliance, or the receiver the oil is drained into, must be brought to no higher than what pressure?40 CFR 82.156(a)(1)(iii); EPA, Service Practice Requirements
The follow-up verification test must be done within how many days of a successful initial test, or of the appliance returning to normal operating conditions?40 CFR 82.157(e)(2)
How long must leak inspection, repair and verification records be kept under 40 CFR 82.157?40 CFR 82.157(l)
If an electronic detector needs a refrigerant to sense, which test gas does EPA prefer over pure refrigerant?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Leak Detection
May a system-dependent recovery device be used on a 40-pound split system?40 CFR 82.156(e)
One appliance serves both an industrial process and other uses. When is it treated as industrial process refrigeration?40 CFR 82.152, industrial process refrigeration
Refrigerant is added to an appliance and the owner's calculation shows the leak rate is over the threshold. How long does the owner have to repair the leaks?40 CFR 82.157(d)
Refrigerant is removed from a system in the fall and no more than that amount is added back in the spring, within one 12-month period. What is this called?40 CFR 82.152, seasonal variance; 40 CFR 82.157(b)
The rule allows two ways of calculating a leak rate. What are they called?40 CFR 82.152, leak rate
Since January 1, 2026, 40 CFR 84.106 has applied leak repair rules to appliances that hold HFC refrigerant. What is the smallest full charge it covers?40 CFR 84.106(a)
Type II certification covers which equipment?40 CFR 82.161(a)(1)(ii)
Under 40 CFR 84.108, automatic leak detection is required on commercial and industrial process refrigeration appliances with what full charge of HFC refrigerant?40 CFR 84.108(a)
Under ASHRAE Standard 15, as EPA's topic list describes it, an equipment room needs which sensor for every refrigerant?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Safety
What does EPA's Type 2 list say about using hydrocarbon refrigerants to retrofit existing equipment?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Refrigeration
What evacuation level does Table 1 set for a very high-pressure appliance, such as one using R-23?40 CFR 82.156(a), Table 1
What happens to the repair deadlines when an appliance is mothballed?40 CFR 82.157(d)(3); 40 CFR 82.152, mothball
What is the leak rate threshold for a comfort cooling appliance under 40 CFR 82.157?40 CFR 82.157(c)(2)
What is the leak rate threshold for industrial process refrigeration under 40 CFR 82.157?40 CFR 82.157(c)(2)
What must recovery equipment hoses be fitted with to keep refrigerant from escaping when they are disconnected?40 CFR 82.152, low-loss fitting; 40 CFR 82.158
What should you never do to a hermetic compressor while the system is under vacuum?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Safety
When a leak repair requires an industrial process shutdown, how long is the repair period?40 CFR 82.157(d)
When is the initial verification test done?40 CFR 82.152, initial verification test; 40 CFR 82.157(e)
When should a repaired or newly assembled system be leak tested?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Leak Detection
Which equipment is excluded from the HFC leak repair rules in 40 CFR 84.106?40 CFR 84.106(a)(3)
Which job is a "major" repair under Subpart F?40 CFR 82.152, major maintenance, service, or repair
Which leak test gas does EPA rank as best?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Leak Detection
Which pair does EPA list as signs of a leak in a high-pressure system?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Leak Detection
Which pair of steps does EPA list for speeding up recovery?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Recovery Techniques
Which refrigerant does the rule give as an example for a high-pressure appliance?40 CFR 82.152, high-pressure appliance
Which refrigerant does the rule give as an example for a medium-pressure appliance?40 CFR 82.152, medium-pressure appliance
Which refrigerant does the rule give as an example for a very high-pressure appliance?40 CFR 82.152, very high-pressure appliance
Which step at the start of recovery speeds up the job?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Recovery Techniques
Who is responsible for calculating the leak rate each time refrigerant is added to a covered appliance?40 CFR 82.157(b)
Who must carry out a leak inspection required by 40 CFR 82.157?40 CFR 82.157(g)
You are using recovery equipment manufactured before November 15, 1993 on a 250-pound R-22 system. What evacuation level does Table 1 require?40 CFR 82.156(a), Table 1
You reach the required recovery vacuum. Why wait a few minutes before opening the system?EPA, Section 608 Test Topics, Type 2 (High-Pressure): Recovery Techniques
Type III: low-pressure 30
A 900-pound comfort cooling chiller exceeded its leak rate. How often must it then be leak inspected?40 CFR 82.157(g)(1)
A chiller with a 1,000-pound full charge lost 1,300 pounds of refrigerant in one calendar year. What does the rule require?40 CFR 82.157(j)
A chiller's refrigerant boils above 85 degrees F at standard atmospheric pressure. How may it be pressurized for a non-major repair?40 CFR 82.156(a)(1)(ii); EPA, Service Practice Requirements
A chiller's refrigerant boils at or below 85 degrees F at standard atmospheric pressure. When pressurizing it for a non-major repair, what does the rule prohibit?40 CFR 82.156(a)(1)(ii)
A comfort cooling chiller holds 900 pounds of R-123. Above what leak rate must the owner repair, retrofit or retire it?40 CFR 82.157(c)(2)
A low-pressure appliance uses a refrigerant whose liquid phase saturation pressure at 104 degrees F is below what value?40 CFR 82.152, low-pressure appliance
A repair on a low-pressure chiller is not major, and the chiller will not be evacuated afterward. Before it is opened it must be brought to what pressure?40 CFR 82.156(a)(1)(ii)
After the liquid has been removed from a low-pressure chiller, what is still left to recover?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recovery Techniques
Before a major repair or disposal, a low-pressure appliance must be evacuated to what level?40 CFR 82.156(a), Table 1
Does the required evacuation level for a low-pressure appliance depend on whether the recovery equipment was made before or after November 15, 1993?40 CFR 82.156(a), Table 1
For leak testing a low-pressure system, which pressurization method does EPA rank first?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Leak Detection
In what format must the Type III test be taken?40 CFR part 82, subpart F, appendix D
On a chiller, which job is a major repair that calls for the full Table 1 evacuation?40 CFR 82.152, major maintenance, service, or repair
Parts of a low-pressure chiller leak so badly that 25 mm of mercury absolute cannot be reached. What level applies to the leaking components?40 CFR 82.156(a)(2)
Recovery equipment for low-pressure appliances must be certified to reach what evacuation level?40 CFR 82.158, Table 2
Refrigerant purged from a chiller is sent to a control device and destroyed. When can it be left out of the leak rate calculation?40 CFR 82.157(k)
Refrigerant released by a chiller's purge unit during normal operation is treated how under the venting prohibition?EPA, Prohibition on Venting Refrigerants
Through which valve does EPA say a centrifugal chiller should be charged?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recharging Techniques
To what temperature should the oil in a low-pressure system be heated before it is removed?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recovery Techniques
Type III certification covers which equipment?40 CFR 82.161(a)(1)(iii)
Under ASHRAE Standard 15, as EPA's topic list describes it, what does an equipment room housing an R-123 chiller need?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Safety
What is the purpose of waiting to open a low-pressure chiller until its pressure has been raised to 0 psig?40 CFR 82.156(a)(1)(ii)
When recharging an evacuated low-pressure chiller, what goes in first?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recharging Techniques
Which group contains only refrigerants the rule lists as low-pressure examples?40 CFR 82.152
Which HCFC does EPA name as the one used in centrifugal chillers?EPA, Phaseout of Class II Ozone-Depleting Substances
Which methods does EPA list for pressurizing a low-pressure system for a non-major repair?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recovery Requirements
Which refrigerant does the rule give as an example for a low-pressure appliance?40 CFR 82.152, low-pressure appliance
Which sign does EPA give for leakage into a low-pressure system?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Leak Detection
While refrigerant is evacuated from a chiller, what should be done with the water in the tubes?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recovery Techniques
You reach 25 mm of mercury absolute on a low-pressure chiller, and a few minutes later the pressure has climbed. What does that indicate?EPA, Section 608 Test Topics, Type 3 (Low-Pressure): Recovery Requirements
How this list was compiled: Written from 40 CFR part 82, subpart F (sections 82.150 to 82.169 and appendix D), 40 CFR part 84, subpart C, and 40 CFR 19.4, read at https://www.ecfr.gov/current/title-40/part-82/subpart-F in the eCFR text dated 2026-09-17, and from EPA's Section 608 pages: Test Topics (https://www.epa.gov/section608/test-topics, last updated by EPA December 5, 2025), Technician Certification Requirements (https://www.epa.gov/section608/section-608-technician-certification-requirements, last updated July 15, 2026), the venting, sales restriction, service practice, safe disposal and leak repair pages, the Class I and Class II phaseout pages, Basic Ozone Layer Science, and Background on HFCs and the AIM Act. All checked 2026-09-18. Each question names the section or page it was written from. Licence: Own work. Questions, answer choices and explanations were written for this site from the rule text and EPA's public pages. Nothing is copied from the EPA test bank that certifying programs assemble their tests from, or from another practice test.
How it works
These unofficial EPA 608 practice tests hold 192 questions in four topic filters: Core, Type I, Type II and Type III. Every question was written from 40 CFR Part 82 Subpart F, 40 CFR Part 84 or a named EPA page, checked on September 18, 2026, and each explanation names that source. Exam mode, under the question, draws 25 questions and uses the 70 percent pass mark from the rule.
Read the full guide
How the Section 608 test is built
Appendix D to Subpart F sets the format. Each test has 25 Core questions plus 25 for each type you sit: Type I for small appliances, Type II for medium, high and very high-pressure equipment, Type III for low-pressure chillers. The closed-book passing score is 70 percent, and a Type I test taken by mail needs 84 percent. A mail-in Type I result cannot count toward Universal. Appendix D gives no time limit, so exam mode here runs without a clock.
From a Core round to a Universal run
Set the Start from menu under the question to Core for an EPA 608 core practice test of 76 questions on ozone science, the venting ban, recovery, sales rules, cylinders and safety. Type I has 30 questions. The Type II filter gives an EPA 608 practice test Type 2 candidates can use alone: 56 questions on evacuation levels, leak detection and leak repair. Type III is an EPA 608 Type 3 practice test of 30 questions on low-pressure chillers. Choose All topics for an EPA 608 universal practice test. Exam mode, under the question, draws 25 at random and marks nothing until you finish. Each round is scored against 70 percent, with a table by topic.
A study guide in question form
Read the explanations and the bank doubles as a free EPA 608 study guide. Each one names its section. The best EPA 608 study guide is still the source, so every citation points to the eCFR or an EPA page. Answers that change carry a date, including the HFC leak repair rules that began on January 1, 2026. Older materials may still quote the 35 and 15 percent leak rates, which stopped applying on January 1, 2019.
Work the Missed pile, under More options, like EPA 608 flashcards: read the question, say the number out loud, then check. Clear my progress, under More options, erases what this browser keeps.
Learn Table 1 of 40 CFR 82.156 as a grid: pressure class, charge under or over 200 pounds, recovery equipment made before or after November 15, 1993.
Keep the leak rate thresholds together: 20 percent for commercial refrigeration, 30 for industrial process refrigeration, 10 for comfort cooling.
Start with Core. It is part of every test, and an open-book Core result cannot be used for Universal, so answer with your notes closed.
Going for all four groups? Use the page as an EPA 608 universal study guide: one topic filter per evening, then a mixed exam round.
Questions and answers
Is the EPA 608 test hard?
It rewards recall more than reasoning. Much of it is numbers: vacuum levels in inches of mercury, leak rate percentages, repair deadlines and dates such as November 15, 1993. We have no pass-rate figure to quote.
How many questions are on the EPA 608 Universal exam?
Appendix D to 40 CFR Part 82 Subpart F says 100: 25 Core questions plus 25 each for Type I, Type II and Type III. Universal can be taken all at once or earned by combining passing scores on separate type tests.
Where can I get an EPA 608 test answers PDF?
Be wary of any such file, or of a list sold as EPA 608 Type 2 test answers. Certifying programs draw each test from a larger EPA bank, so many versions exist. Print, on the score card here, makes a question sheet, and a tick adds an answer key.
Does this EPA certification practice test cover Section 609?
No. It covers Section 608 only, which is stationary refrigeration and air conditioning. Universal is a 608 credential, so an EPA universal practice test stops there too. Section 609 is a separate certification for motor vehicle air conditioners under 40 CFR Part 82 Subpart B.
Does Section 608 certification expire?
EPA's certification requirements page, last updated July 15, 2026, says Section 608 credentials do not expire. Under 40 CFR 82.161, keep a copy of your certificate at your place of business until three years after you stop working as a technician.
Can this EPA 608 certification practice test replace my program's manual?
Use it alongside the manual. This is an unofficial 608 practice test written from public sources, not by EPA or a certifying program, and it is not safety training. Every answer names its source.