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Free EPA 608 Practice

EPA 608 Practice Exam

55 practice questions across Core and Type I, II & III — with an instant explanation and an EPA source on every answer. Free, unlimited retakes.

Choose your practice set

Questions are pulled at random and shuffled each time. You get a passing line of 70% — the same threshold as the real EPA 608 exam.

Study aid only. This practice exam is validated against EPA materials (subject-matter-expert reviewed 2026-06-04), but it is not the official certification exam and does not certify you. Take the real exam through an EPA-approved certifying organization — start at epa.gov/section608. Always defer to the official 608 manual and current EPA rules.

All 55 questions, with answers and explanations

The full bank, grouped the way the EPA groups the certification. Every answer carries the reasoning and, where one exists, the EPA citation it comes from. Read it as a study guide, then use the quiz above to test yourself.

Reviewed by a subject-matter expert on 2026-06-04. This is a study aid and is not the official EPA certification exam.

Core

47 questions

1. Under which section of the Clean Air Act are technicians who service STATIONARY refrigeration and air-conditioning equipment certified?

  • A. Section 609
  • B. Section 608  ← correct
  • C. Section 612
  • D. Section 611

Answer: B. Section 608 of the Clean Air Act governs stationary refrigeration and A/C. Section 609 is the separate program for motor vehicle air conditioners (MVACs).

Source: EPA.gov reference · Topic: Core - Legal framework

2. Which certification type is required to service or dispose of SMALL APPLIANCES?

  • A. Type I  ← correct
  • B. Type II
  • C. Type III
  • D. Type IV

Answer: A. Type I certification covers small appliances (factory-sealed units with 5 lb or less of refrigerant). There is no Type IV.

Source: EPA.gov reference · Topic: Core - Certification types

3. Which certification is required to service HIGH-pressure appliances such as a residential R-410A split system (excluding small appliances and MVACs)?

  • A. Type I
  • B. Type II  ← correct
  • C. Type III
  • D. Universal only

Answer: B. Type II covers high- and very-high-pressure appliances except small appliances and MVACs. Universal also qualifies, but Type II is the specific required minimum.

Source: EPA.gov reference · Topic: Core - Certification types

4. Which certification is required to service LOW-pressure appliances such as an R-123 centrifugal chiller?

  • A. Type I
  • B. Type II
  • C. Type III  ← correct
  • D. Section 609

Answer: C. Type III covers low-pressure appliances (e.g., R-11, R-123, R-113 chillers that operate in a vacuum on the low side).

Source: EPA.gov reference · Topic: Core - Certification types

5. To earn UNIVERSAL certification, a technician must pass:

  • A. Only the Core section
  • B. Core plus Type I only
  • C. Core plus Type II and Type III only
  • D. Core plus Type I, Type II, and Type III  ← correct

Answer: D. Universal certification requires passing the Core section and all three type-specific sections (I, II, and III).

Source: EPA.gov reference · Topic: Core - Certification types

6. What is the minimum passing score for each section of the EPA Section 608 exam?

  • A. 60%
  • B. 70%  ← correct
  • C. 75%
  • D. 80%

Answer: B. A score of 70% is required to pass each section (Core and each Type).

Source: EPA.gov reference · Topic: Core - Certification logistics

7. How often must a Section 608 technician renew their certification?

  • A. Every year
  • B. Every 3 years
  • C. Every 5 years
  • D. Never - it does not expire  ← correct

Answer: D. Section 608 technician certification does not expire and never needs to be renewed. (The 5-year figure on the exam refers to DOT cylinder retesting, a common trap.)

Source: EPA.gov reference · Topic: Core - Certification logistics

8. Which statement about the Core exam is correct for a technician seeking UNIVERSAL certification?

  • A. The Core may always be taken open-book by mail
  • B. The Core must be taken as a proctored (closed-book) exam  ← correct
  • C. The Core is optional if all three Type exams are passed
  • D. The Core is only required for Type III

Answer: B. The Core section must be taken as a proctored exam to count toward Universal certification.

Source: EPA.gov reference · Topic: Core - Certification logistics

9. ODP (Ozone Depletion Potential) is indexed against which reference substance equal to 1.0?

  • A. CO2
  • B. CFC-11 (R-11)  ← correct
  • C. HFC-134a
  • D. Nitrogen

Answer: B. ODP is referenced to CFC-11 = 1.0. CO2 = 1.0 is the reference for GWP, not ODP.

Source: EPA.gov reference · Topic: Core - Ozone/atmosphere

10. Which statement best describes HFC refrigerants such as R-410A?

  • A. High ozone depletion potential, low global warming potential
  • B. Zero ozone depletion potential, but high global warming potential  ← correct
  • C. Zero ozone depletion potential and zero global warming potential
  • D. High ozone depletion potential and high global warming potential

Answer: B. HFCs contain no chlorine, so their ODP is 0, but many have high GWP, which is why they are being phased DOWN under the AIM Act.

Source: EPA.gov reference · Topic: Core - Ozone/atmosphere

11. Since November 15, 1995, it has been illegal to knowingly vent which substances during service or disposal?

  • A. Only CFCs
  • B. CFC and HCFC refrigerants (ozone-depleting substances)  ← correct
  • C. Only nitrogen
  • D. Only HFCs

Answer: B. The venting ban took effect Nov 15, 1995 for ozone-depleting refrigerants (CFCs and HCFCs). It was later (Nov 15, 2016) extended to non-exempt substitutes like most HFCs.

Source: EPA.gov reference · Topic: Core - Venting prohibition

12. Which of the following releases is NOT a violation of the venting prohibition?

  • A. Opening a system and letting the charge escape because it is contaminated
  • B. A 'de minimis' release while making a good-faith attempt to recover refrigerant  ← correct
  • C. Venting a full charge of R-22 to atmosphere before scrapping a unit
  • D. Releasing R-410A because the recovery machine is broken

Answer: B. De minimis releases (e.g., the small puff when connecting/disconnecting hoses during good-faith recovery) are permitted. The other options are illegal venting.

Source: EPA.gov reference · Topic: Core - Venting prohibition

13. Which gas may be released to atmosphere because it is not a refrigerant and is used for pressure/leak testing?

  • A. R-22
  • B. R-134a
  • C. Nitrogen  ← correct
  • D. R-410A

Answer: C. Nitrogen is not an ODS or a regulated substitute refrigerant, so it may be released after pressure/leak testing.

Source: EPA.gov reference · Topic: Core - Venting prohibition

14. Using recovery equipment manufactured AFTER November 15, 1993, what vacuum level must be reached on a HIGH-pressure appliance containing 200 lb or more of refrigerant?

  • A. 0 inches Hg vacuum
  • B. 10 inches Hg vacuum  ← correct
  • C. 15 inches Hg vacuum
  • D. 25 inches Hg vacuum

Answer: B. Post-Nov-15-1993 equipment must evacuate a high-pressure appliance with 200+ lb to 10 in. Hg vacuum. (Under 200 lb requires 0 in. Hg.)

Source: EPA.gov reference · Topic: Core - Recovery levels

15. With recovery equipment made after Nov 15, 1993, a MEDIUM-pressure appliance containing 200 lb or more must be evacuated to:

  • A. 4 inches Hg vacuum
  • B. 10 inches Hg vacuum
  • C. 15 inches Hg vacuum  ← correct
  • D. 25 inches Hg vacuum

Answer: C. Medium-pressure appliances with 200+ lb require 15 in. Hg vacuum with post-1993 equipment; under 200 lb requires 10 in. Hg.

Source: EPA.gov reference · Topic: Core - Recovery levels

16. 'Recover' refrigerant means to:

  • A. Reprocess it to AHRI 700 purity and verify by lab test
  • B. Remove it from an appliance and store it externally without necessarily testing or processing it  ← correct
  • C. Clean it on-site for reuse by the same owner
  • D. Destroy it by incineration

Answer: B. Recover = remove refrigerant in any condition and store it externally without necessarily testing or processing. Cleaning for same-owner reuse is 'recycle'; meeting AHRI 700 is 'reclaim.'

Source: EPA.gov reference · Topic: Core - Recover/recycle/reclaim

17. Recycled refrigerant may be returned to service:

  • A. In any equipment, including sold to a new owner
  • B. Only in equipment owned by the same owner  ← correct
  • C. Only after destruction and re-manufacture
  • D. Only in motor vehicle air conditioners

Answer: B. Recycled refrigerant is cleaned on-site (oil separation, filter-driers) for reuse by the SAME owner. To transfer to a new owner it must be reclaimed to AHRI 700.

Source: EPA.gov reference · Topic: Core - Recover/recycle/reclaim

18. To be RECLAIMED, used refrigerant must be reprocessed to the purity specified by which standard?

  • A. ASHRAE 15
  • B. AHRI (ARI) Standard 700  ← correct
  • C. UL 1995
  • D. NFPA 70

Answer: B. Reclaimed refrigerant must meet AHRI Standard 700 purity (codified in Appendix A of 40 CFR 82 Subpart F) and be verified by the prescribed lab method.

Source: EPA.gov reference · Topic: Core - Reclamation/AHRI 700

19. Who is permitted to RECLAIM refrigerant for sale to a new owner?

  • A. Any Section 608 certified technician
  • B. Only an EPA-certified refrigerant reclaimer  ← correct
  • C. Any equipment owner
  • D. Only the original manufacturer

Answer: B. Only EPA-certified reclaimers may reclaim refrigerant to AHRI 700 and sell it. A field technician can recover and recycle but cannot reclaim for resale.

Source: EPA.gov reference · Topic: Core - Reclamation

20. The Section 608 leak-repair requirements apply to appliances with a full charge of at least how many pounds?

  • A. 5 pounds
  • B. 15 pounds
  • C. 50 pounds  ← correct
  • D. 200 pounds

Answer: C. Leak-repair provisions apply to appliances containing 50 or more pounds of refrigerant.

Source: EPA.gov reference · Topic: Core - Leak repair

21. What is the annual leak-rate trigger for COMFORT COOLING appliances (50+ lb)?

  • A. 10%  ← correct
  • B. 20%
  • C. 30%
  • D. 35%

Answer: A. Comfort cooling triggers at 10% per year. Commercial refrigeration is 20%; industrial process refrigeration is 30%.

Source: EPA.gov reference · Topic: Core - Leak repair

22. What is the annual leak-rate trigger for COMMERCIAL REFRIGERATION appliances (50+ lb)?

  • A. 10%
  • B. 20%  ← correct
  • C. 30%
  • D. 15%

Answer: B. Commercial refrigeration triggers at 20% per year (comfort cooling 10%, IPR 30%).

Source: EPA.gov reference · Topic: Core - Leak repair

23. What is the annual leak-rate trigger for INDUSTRIAL PROCESS REFRIGERATION (IPR)?

  • A. 10%
  • B. 20%
  • C. 30%  ← correct
  • D. 50%

Answer: C. Industrial process refrigeration triggers at 30% per year.

Source: EPA.gov reference · Topic: Core - Leak repair

24. Once a leak exceeding the trigger rate is discovered, owners/operators generally must repair it within:

  • A. 24 hours
  • B. 7 days
  • C. 30 days  ← correct
  • D. 1 year

Answer: C. Leaks above the trigger rate must be repaired within 30 days, or a retrofit/retire plan must be made within 30 days and completed within 1 year.

Source: EPA.gov reference · Topic: Core - Leak repair

25. After the 2020 rule, the Section 608 LEAK-REPAIR requirements are currently enforced for which refrigerants? (verify current EPA rule)

  • A. Only HFC substitutes
  • B. Ozone-depleting (CFC/HCFC) refrigerants only
  • C. All refrigerants including HFCs  ← correct
  • D. Only natural refrigerants

Answer: C. The 2016 rule extended leak-repair to HFC substitutes; a 2020 rule rescinded that extension (so from 2020-2025 it applied to ozone-depleting refrigerants only). EPA's 2024 AIM Act Emissions Reduction & Reclamation (ER&R) rule (final 2024-10-11) then re-imposed leak inspection/repair on appliances containing >= 15 lb of an HFC (or substitute with GWP > 53), effective January 1, 2026, under 40 CFR Part 84 Subpart B. Trigger annual leak rates are 30% industrial process refrigeration, 20% commercial refrigeration, 10% comfort cooling and other; repair required within 30 days (120 days if process shutdown needed). As of June 2026 the rule has been upheld in federal court; an EPA NPRM proposes to exempt road and intermodal-container transport refrigeration units, but that exemption is NOT yet final. VERIFY the live EPA rule at exam/publish time.

Source: 40 CFR Part 84 Subpart B; EPA ER&R Leak Repair fact sheet 2026-01; https://www.epa.gov/climate-hfcs-reduction/regulatory-actions-managing-hfc-use-and-reuse · Topic: Core - Regulatory updates

26. A recovery cylinder must never be filled beyond what percentage of its capacity?

  • A. 50%
  • B. 70%
  • C. 80%  ← correct
  • D. 100%

Answer: C. Recovery cylinders must not exceed 80% full to leave room for liquid thermal expansion and prevent rupture.

Source: EPA.gov reference · Topic: Core - Cylinders / 80% rule

27. Why must a recovery cylinder be filled to no more than 80%?

  • A. To leave room for liquid refrigerant to expand as temperature rises  ← correct
  • B. Because DOT charges fees above 80%
  • C. To make the cylinder lighter to carry
  • D. To allow nitrogen to be added on top

Answer: A. The 20% headspace accommodates thermal (hydrostatic) expansion of liquid refrigerant; an over-filled cylinder can rupture or explode when warmed.

Source: EPA.gov reference · Topic: Core - Cylinders / 80% rule

28. What is the most reliable way to ensure a recovery cylinder is not overfilled?

  • A. Estimate by feeling the cylinder temperature
  • B. Weigh it on a refrigerant scale  ← correct
  • C. Listen for the sound of the compressor
  • D. Time the recovery for 10 minutes

Answer: B. Placing the cylinder on a scale and tracking weight (against the cylinder's rated capacity and refrigerant density) is the most reliable method; float/electronic shutoffs also help.

Source: EPA.gov reference · Topic: Core - Cylinders / 80% rule

29. A DOT-39 cylinder is:

  • A. A refillable recovery cylinder rated for high pressure
  • B. A disposable, single-use cylinder that is illegal to refill  ← correct
  • C. The standard cylinder used to store reclaimed refrigerant
  • D. A nitrogen-only cylinder

Answer: B. DOT-39 cylinders are disposable (one-trip). It is illegal to refill them, and they must not be used for recovery.

Source: EPA.gov reference · Topic: Core - DOT cylinders

30. How often must a refillable DOT recovery cylinder be hydrostatically retested/recertified?

  • A. Every year
  • B. Every 3 years
  • C. Every 5 years  ← correct
  • D. Only once when new

Answer: C. Refillable DOT cylinders must be hydrostatically retested and date-stamped every 5 years; the date is on the collar.

Source: EPA.gov reference · Topic: Core - DOT cylinders

31. By color, an EPA recovery cylinder is identified as:

  • A. All green
  • B. Gray body with a yellow top/shoulder  ← correct
  • C. All red
  • D. Blue body with white top

Answer: B. Recovery cylinders are gray with a yellow top (shoulder), distinguishing them from virgin refrigerant cylinders.

Source: EPA.gov reference · Topic: Core - Cylinder identification

32. Restricted refrigerants may generally be sold only to:

  • A. Anyone over 18
  • B. EPA Section 608- or 609-certified technicians (or buyers for resale)  ← correct
  • C. Only manufacturers
  • D. Only government agencies

Answer: B. The sales restriction limits purchase of restricted refrigerant to EPA-certified (608/609) technicians or those buying for resale.

Source: EPA.gov reference · Topic: Core - Sales restriction

33. For how long must technicians and refrigerant retailers keep required records?

  • A. 1 year
  • B. 2 years
  • C. 3 years  ← correct
  • D. 7 years

Answer: C. Records (service, disposal, and refrigerant sales) must be retained for a minimum of 3 years.

Source: EPA.gov reference · Topic: Core - Recordkeeping

34. When disposing of a 'mid-size' appliance (5-50 lb), the technician who recovers the refrigerant must record all EXCEPT:

  • A. Location and date of recovery and type of refrigerant
  • B. Quantity by type recovered each calendar month
  • C. The person and date the refrigerant was transferred for reclamation/destruction
  • D. The homeowner's Social Security number  ← correct

Answer: D. Required records include location/date/type, monthly quantities by type, and transfer details. A customer's SSN is never a required EPA record.

Source: EPA.gov reference · Topic: Core - Recordkeeping

35. Which class of refrigerants (e.g., R-11 and R-12) had the HIGHEST ozone depletion potential and was the first phased out?

  • A. HFCs
  • B. HFOs
  • C. CFCs (chlorofluorocarbons)  ← correct
  • D. Hydrocarbons

Answer: C. CFCs (Class I ODS) have the highest ODP (~0.6-1.0) and U.S. production ended Jan 1, 1996.

Source: EPA.gov reference · Topic: Core - Phaseout history

36. As of January 1, 2020, what is true about virgin (newly produced) R-22 in the United States?

  • A. It may be freely produced and imported
  • B. Production and import of virgin R-22 ended; only reclaimed/recycled/stockpiled R-22 may service existing systems  ← correct
  • C. It is banned for all uses including servicing
  • D. It is only allowed in new equipment

Answer: B. Virgin R-22 production/import ended Jan 1, 2020. Existing equipment may be serviced only with reclaimed, recycled, or previously stockpiled R-22.

Source: EPA.gov reference · Topic: Core - Phaseout history

37. The AIM Act of 2020 directs EPA to phase DOWN U.S. production and consumption of HFCs by approximately how much, and by when?

  • A. 50% by 2030
  • B. 85% by 2036  ← correct
  • C. 100% by 2025
  • D. 25% by 2040

Answer: B. The AIM Act establishes a phasedown of HFC production and consumption by about 85% by 2036, consistent with the Kigali Amendment.

Source: EPA.gov reference · Topic: Core - AIM Act

38. Which international agreement first established the phaseout of ozone-depleting substances?

  • A. The Kyoto Protocol
  • B. The Paris Agreement
  • C. The Montreal Protocol (1987)  ← correct
  • D. The Kigali Amendment (2016)

Answer: C. The Montreal Protocol (1987) is the treaty phasing out ODS. The Kigali Amendment (2016) later added the HFC phase-down.

Source: EPA.gov reference · Topic: Core - Treaties

39. A technician who only services car air conditioners needs which certification?

  • A. Section 608 Type I
  • B. Section 608 Type II
  • C. Section 609 (MVAC)  ← correct
  • D. Section 608 Universal

Answer: C. Motor vehicle A/C (MVAC) work is covered by Section 609, a separate program from the Section 608 Types.

Source: EPA.gov reference · Topic: Core - 608 vs 609

40. You recover an unknown mixture of refrigerants into a cylinder. What must you do with it?

  • A. Vent it since it cannot be identified
  • B. Recharge it into the next system you service
  • C. Send it for reclamation or destruction; never vent it  ← correct
  • D. Pour it into a floor drain

Answer: C. Mixed/contaminated refrigerant cannot be recycled or reused; it must be sent for reclamation or destruction. Venting is always illegal.

Source: EPA.gov reference · Topic: Core - Cross-contamination

41. Who is required to hold EPA Section 608 certification?

  • A. Only people who manufacture refrigerant
  • B. Anyone who maintains, services, repairs, or disposes of equipment in a way that could release refrigerant  ← correct
  • C. Only HVAC company owners
  • D. Only those who purchase refrigerant in bulk

Answer: B. Certification is required for technicians who could release ODS or substitute refrigerants while maintaining, servicing, repairing, or disposing of stationary A/C and refrigeration equipment.

Source: EPA.gov reference · Topic: Core - Certification scope

42. Recovery/recycling equipment manufactured on or after November 15, 1993 must be:

  • A. Painted yellow and gray
  • B. Certified by an EPA-approved equipment testing organization  ← correct
  • C. Rated for at least 200 lb
  • D. Owned by the equipment manufacturer

Answer: B. Recovery/recycling equipment made on/after Nov 15, 1993 must be certified by an EPA-approved testing organization to meet the required evacuation standards.

Source: EPA.gov reference · Topic: Core - Recovery equipment certification

43. Knowingly venting R-410A (an HFC) during service became prohibited on:

  • A. November 15, 1995
  • B. January 1, 2017  ← correct
  • C. January 1, 2020
  • D. It has never been prohibited because HFCs have zero ODP

Answer: B. The original statutory venting prohibition (Nov 15, 1995) covered CFC/HCFC refrigerants. EPA's 2016 final rule (published Nov 18, 2016) extended the venting prohibition to non-exempt substitutes (most HFCs, including R-410A) with a compliance date of January 1, 2017. Zero ODP does not exempt HFCs from the venting ban.

Source: EPA Section 608 venting prohibition (substitutes effective Jan 1, 2017) · Topic: Core - Venting / substitutes

44. Using recovery equipment made BEFORE November 15, 1993, a high-pressure appliance with 200+ lb must be evacuated to:

  • A. 0 inches Hg vacuum
  • B. 4 inches Hg vacuum  ← correct
  • C. 10 inches Hg vacuum
  • D. 25 inches Hg vacuum

Answer: B. Pre-Nov-15-1993 equipment has lower required vacuum levels; a high-pressure appliance with 200+ lb requires 4 in. Hg (vs. 10 in. Hg for post-1993 equipment).

Source: EPA.gov reference · Topic: Core - Recovery levels

45. GWP (Global Warming Potential) is measured relative to which reference substance assigned a value of 1?

  • A. CFC-11
  • B. Carbon dioxide (CO2)  ← correct
  • C. Methane
  • D. Water vapor

Answer: B. GWP is indexed to CO2 = 1 (typically over a 100-year horizon). ODP is the one indexed to CFC-11 = 1.

Source: EPA.gov reference · Topic: Core - Atmosphere

46. The person who takes the FINAL step in the disposal chain of an appliance (e.g., a scrap recycler) must:

  • A. Vent any remaining refrigerant
  • B. Verify that refrigerant was recovered to the required level, or ensure a signed statement of recovery accompanies the appliance  ← correct
  • C. Ignore refrigerant because the appliance is being scrapped
  • D. Refill the appliance before crushing it

Answer: B. The final disposer must either recover remaining refrigerant to the required level themselves or obtain a signed statement confirming proper recovery already occurred.

Source: EPA.gov reference · Topic: Core - Disposal

47. Which of the following is a lower-GWP refrigerant class being adopted as HFCs are phased down (and which may be mildly flammable, A2L)?

  • A. CFCs
  • B. Halons
  • C. HFOs / A2L blends such as R-32 and R-454B  ← correct
  • D. R-12

Answer: C. HFOs (e.g., R-1234yf) and A2L blends (R-32, R-454B) are lower-GWP alternatives replacing high-GWP HFCs under the AIM Act technology transitions. Many are mildly flammable (A2L).

Source: EPA.gov reference · Topic: Core - Next-gen refrigerants

Type I

6 questions

1. A 'small appliance' under Section 608 is one that is factory-sealed and charged with how much refrigerant?

  • A. 5 pounds or less  ← correct
  • B. 15 pounds or less
  • C. 50 pounds or less
  • D. Exactly 5 pounds

Answer: A. A small appliance is fully manufactured, charged, and hermetically sealed in a factory with 5 pounds or less of refrigerant.

Source: EPA.gov reference · Topic: Type I - Small appliance definition

2. Which of the following is NOT considered a small appliance?

  • A. A household refrigerator
  • B. A window air conditioner
  • C. A residential 3-ton split-system A/C with a 7 lb charge  ← correct
  • D. A drinking water cooler

Answer: C. A split system charged in the field with more than 5 lb is not factory-sealed at 5 lb or less, so it is not a small appliance. The others are classic small appliances.

Source: EPA.gov reference · Topic: Type I - Small appliance definition

3. When recovering from a small appliance whose compressor IS still operating, what percentage of the refrigerant must recovery equipment capture?

  • A. 80%
  • B. 90%  ← correct
  • C. 95%
  • D. 99%

Answer: B. 90% must be recovered if the compressor is operating; 80% if the compressor is NOT operating. Equipment may instead evacuate to 4 in. Hg.

Source: EPA.gov reference · Topic: Type I - Small appliance recovery

4. When the compressor of a small appliance is NOT operating, the minimum recovery percentage is:

  • A. 70%
  • B. 80%  ← correct
  • C. 90%
  • D. 100%

Answer: B. If the compressor is inoperative, 80% recovery is required (vs. 90% with a working compressor), or evacuation to 4 in. Hg.

Source: EPA.gov reference · Topic: Type I - Small appliance recovery

5. System-dependent (passive) recovery is permitted only for:

  • A. Any appliance under 200 lb
  • B. Small appliances with 15 lb or less of refrigerant  ← correct
  • C. Low-pressure chillers
  • D. Industrial process refrigeration

Answer: B. Passive (system-dependent) recovery, which uses the appliance's own pressure/compressor rather than a self-contained machine, is allowed only on small appliances with 15 lb or less.

Source: EPA.gov reference · Topic: Type I - Passive recovery

6. As an alternative to the 80%/90% recovery percentages, small-appliance recovery equipment (made on/after Nov 15, 1993) may instead evacuate the appliance to:

  • A. 4 inches Hg vacuum  ← correct
  • B. 10 inches Hg vacuum
  • C. 15 inches Hg vacuum
  • D. 25 inches Hg vacuum

Answer: A. For small appliances, recovery equipment may meet the requirement by evacuating to 4 in. Hg vacuum instead of meeting the 90%/80% percentage.

Source: EPA.gov reference · Topic: Type I - Recovery options

Type II

1 question

1. Which refrigerant is a LOW-pressure refrigerant requiring Type III certification?

  • A. R-410A
  • B. R-22
  • C. R-123  ← correct
  • D. R-404A

Answer: C. R-123 (like R-11) is a low-pressure refrigerant used in centrifugal chillers. R-22, R-410A, and R-404A are high-pressure (Type II).

Source: EPA.gov reference · Topic: Type II - Pressure classes

Type III

1 question

1. A LOW-pressure appliance must be evacuated to approximately what level (the value commonly tested)?

  • A. 4 inches Hg vacuum
  • B. 10 inches Hg vacuum
  • C. 15 inches Hg vacuum
  • D. 25 (inches Hg vacuum / mm Hg absolute)  ← correct

Answer: D. The low-pressure recovery requirement is 25. The CFR (40 CFR 82.156 Table 1) actually carries BOTH wordings: '25 mm Hg absolute' for recovery equipment manufactured/imported on or after Nov 15, 1993, and '25 in. Hg vacuum' for equipment made before that date. Effectively all recovery machines in service today are post-1993 units, so the operative number for current techs is 25 mm Hg absolute (~ 4 in. Hg absolute / ~ 25.9 in. Hg vacuum). The number to know is 25.

Source: 40 CFR 82.156(a)(1) Table 1; https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82/subpart-F/section-82.156 · Topic: Type III - Low-pressure recovery