EPA 608 Universal certification

Type I, Type II and Type III together.

What the rule says

"Persons who maintain, service, repair, or dispose of all appliances described in paragraph (a)(1)(i) through (iii) of this section must be certified as Universal technicians."

Equipment this applies to

• Household or commercial refrigerators and freezers. Factory-sealed with 5 lb or less of refrigerant, so it is a small appliance.
• Window, portable or packaged terminal AC units. Named explicitly in the small appliance definition.
• Vending machines, water coolers, under-counter ice makers. Named explicitly in the small appliance definition.
• Dehumidifiers. Named explicitly in the small appliance definition.
• Residential split systems and heat pumps (R-410A, R-22). R-410A and R-22 are high-pressure refrigerants, and the equipment is not factory-sealed at 5 lb or less.
• Commercial rooftop units. High-pressure appliance above the small appliance threshold.
• Supermarket or cold storage refrigeration. High-pressure appliance, field-charged.
• Field-charged R-134a equipment, not factory-sealed (chillers, transport, process). R-134a is medium-pressure, and Type II covers medium as well as high and very high. Note the "not factory-sealed" part: a sealed R-134a unit holding 5 lb or less, such as a household fridge or a vending machine, is a small appliance and therefore Type I instead.
• Ultra-low-temperature or cascade systems (R-23, R-508). Very high-pressure appliances fall under Type II, provided the unit is not a factory-sealed small appliance.
• Centrifugal chillers using R-11, R-123 or R-245fa. Those refrigerants sit below 45 psia at 104 °F, which is the low-pressure definition.

The core test must be taken proctored to attain Universal certification, so an open-book take-at-home core will not get you there.

What the exam actually covers

Every path includes the Core section, which is 54 distinct topics in our bank across 93 questions. Then you add all three sections. The breakdown below is the topic distribution of our own question bank, mapped to the published outline, so it shows where the weight of the material sits rather than guessing.

Core (Group I), 54 topics

Montreal caa 5Odp chlorine 5Ozone chemistry 4Phaseout schedule 4Pt charts 4Superheat subcool 4Vc cycle states 4Certification types 3Industry outlook 3Sales restriction 3Three rs definitions 3608 vs 609 2Evacuation dehydration 2Non condensables 2Ozone effects 2Recordkeeping 2Vc cycle components 2Venting exceptions 2Venting prohibition 2Apprentice supervision 1Disposal 1Evacuation purpose 1Evacuation vacuum measurement 1Exempt substitutes 1

Type I: Small Appliances, 30 topics

Recovery techniques 9Evacuation requirements 7Equipment certification 6Sealed system access 6Small appliance definition 4Leak handling 3Certification types 2Charging topping off 2Covered equipment examples 2Disposal recovery levels 2Pre 1993 equipment 2Recovery 90 rule 2Safe disposal responsibility 2Verification statement 2Disposal equipment 1Evacuation 4 inhg 1Exam structure 1Open book availability 1Open book limitations 1Open book pass threshold 1Passive recovery technique 1Proctored pass threshold 1Recovery 80 90 rationale 1Recovery 80 rule 1

Type II: High-Pressure Systems, 38 topics

Evac levels table 9Leak detection methods 4Recovery speed 4Cylinder safety 3Leak inspection requirements 3Leak rate calculation 3Leaky appliance exception 3Push pull 3Appliance categories 2Ashrae 15 2Compressor oils 2Evacuation levels 2Leak rate triggers 2Liquid vs vapor 2Non major repair exception 2Retrofit 2Accumulator 1Applicability threshold 1Chronic leak reporting 1Cycle components 1Gauge manifold 1Hp appliance definition 1Hp appliance examples 1Hp definition 1

Type III: Low-Pressure Systems, 24 topics

Safety 9Recovery procedure 8Disposal reclamation 8Evacuation levels 7Leak repair pressurizing 7Charging 4Leak rates 4Air infiltration 3Below atmospheric 3Heating refrigerant 3Evacuation vacuum 2Leak check pressure 2Purge units 2Rupture disc 2Water boxes 2Charging freeze protection 1Leak rate triggers 1Lp definition 1Lp refrigerants 1Modern refrigerants 1Phaseout supply 1Pressure classes 1Recovery freeze protection 1Scope 1

You do not have to sit it in one go

Universal is Type I, II and III together. You can take it as a single 100-question test, or earn it by combining passing results from the separate type tests. The one restriction that matters: a mail-in Type I cannot count toward it, because Universal requires the core to be taken proctored.

Practice it

Take the full 100-question simulation, and anything you miss goes into your notebook so you can come back to exactly the questions that caught you out.

Before you book

• Where to take the exam: all 87 EPA-approved organisations, 15 of which test remotely or online.
• What score you actually need, and why the widely quoted 72 percent is not what the regulation says.
• Still not sure which type? The chooser works it out from the equipment you service.

One thing that can change the answer

The regulation says plainly that "persons who dispose of small appliances, MVACs, and MVAC-like appliances are not required to be certified." Disposal of medium, high, very high or low-pressure appliances still requires the matching type. So the same person can need certification to service a unit and not need it to scrap a different one.

Sources

Certification types and what each authorises: 40 CFR 82.161. Equipment and pressure-class definitions: 40 CFR 82.152. Exam structure and passing scores: 40 CFR Part 82, Subpart F, Appendix D. Topic counts are from this site's own question bank, mapped to the published outline. Verified 2026-08-15.