What the Type 1 exam covers
Type 1 (Type I in older material) certification governs small appliances: factory sealed systems containing 5 lbs or less of refrigerant, such as domestic refrigerators, window air conditioners, PTAC units, vending machines, and water coolers. The 25-question section tests three areas:
- Recovery standards: the required recovery percentage depends on whether the appliance compressor is operating or not operating.
- Self contained vs system dependent (passive) recovery: both are legal on small appliances; the exam tests which is which.
- Safety: R-12 decomposing near an open flame produces phosgene, a toxic gas; flammable R-600a (isobutane) in modern domestic fridges needs special handling.
How EPA defines a small appliance: 5 pounds or less, sealed at the factory
Under 40 CFR §82.152, a small appliance is any appliance fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant. The regulation names refrigerators and freezers, room air conditioners including window units and PTACs, packaged terminal heat pumps, dehumidifiers, under the counter ice makers, vending machines, and drinking water coolers. The threshold is the refrigerant charge, not the appliance weight: split system residential units usually hold more and fall under the EPA 608 Type 2 practice test; low pressure chillers on R-123 or R-11 fall under the EPA 608 Type 3 practice test.
Who needs Type 1. Any technician who handles refrigerant in small appliances must hold at least Type 1 under Section 608 of the Clean Air Act. Every candidate passes the 25-question Core section first, covered by the EPA 608 Core practice test; Core plus all three Types is Universal, the 100-question sitting the EPA 608 Universal practice test simulates.
Venting exemptions. The venting prohibition covers CFC, HCFC, and HFC refrigerants and their substitutes, so R-12, R-22, and R-134a may never be knowingly released. The Type 1 test asks the exempt substitutes as a select all question: ammonia (R-717), carbon dioxide (R-744), nitrogen (R-728), and water. Hydrocarbons such as R-600a and R-290 are exempt only in the end uses EPA has listed.
Type 1 recovery requirements: 90%, 80%, or 4 inches of mercury
Unlike Type 2 and Type 3, Type 1 recovery is set as a percentage of the refrigerant charge, with a 4 inch vacuum alternative. Under 40 CFR §82.156(h), the required amount depends on whether the appliance compressor is running and on the manufacture date of the recovery equipment. The EPA 608 Type 1 study guide explains where the numbers come from; the cheat sheet in the EPA 608 study guide puts every section's thresholds on one page.
Required recovery by compressor status and recovery equipment date
Required recovery for a small appliance is 90%, 80%, or 4 inches of mercury vacuum, set by compressor status and recovery equipment date.
| Condition when you recover | Required recovery |
|---|---|
| Compressor is operating (recovery equipment made on or after Nov 15, 1993) | 90% of the charge |
| Compressor is not operating (recovery equipment made on or after Nov 15, 1993) | 80% of the charge |
| Recovery equipment made before Nov 15, 1993, compressor operating or not | 80% of the charge |
| Alternative for either case, evacuate the appliance | 4 inches of mercury vacuum |
Why 90% is the operating number. A running compressor pushes refrigerant out, so the operating compressor sets the higher bar (90%) and a dead compressor the lower one (80%); the rule is the same whether the recovery equipment is system dependent or self contained.
Self contained vs system dependent (passive) recovery
Self contained (active) recovery equipment has its own compressor or pump, so it pulls refrigerant out whether or not the appliance compressor runs. System dependent (passive) equipment has no pump of its own: it relies on the appliance compressor, or the pressure inside the sealed system, to push refrigerant into a recovery bag or cylinder. Under 40 CFR §82.158, system dependent equipment may only be used on appliances that normally hold 15 lbs or less of refrigerant. Both methods are held to the 90% and 80% targets in the recovery table; the exam asks which method a description matches and which one carries the 15 pound limit.
Piercing valves and recovery bags. A piercing valve (saddle or bullet piercing valve) attaches to sealed system tubing without soldering to give refrigerant access. Solderless piercing valves are for temporary access and must not stay on the appliance, because they leak over time; a solder type piercing valve is the choice when the valve will remain. Recovery bags and passive recovery cylinders are the usual containers for system dependent recovery.
DOT recovery cylinders, labels, and the PT chart check for noncondensables
Recovered refrigerant goes into a refillable recovery cylinder with a DOT specification, gray with a yellow top, never into a disposable (DOT 39) cylinder, which must not be refilled. Fill it to no more than 80% of capacity by weight, keep each refrigerant in its own labeled cylinder; a mixed cylinder cannot be reclaimed. To check for noncondensables such as air or nitrogen, let the cylinder sit until temperature and pressure are stable, then compare the pressure to the PT chart value for that refrigerant. A reading above the chart means noncondensables are present; the check only works when the refrigerant is known and both readings are stable.
Taking the Type 1 exam: providers, open book, retakes
The Type 1 exam is given by EPA-approved certifying organizations, closed book and proctored, with an open book mail in alternative at a higher pass mark.
ESCO Institute and the other EPA-approved certifying organizations
EPA does not write or give the Section 608 exam; it approves certifying organizations, each administering its own version to EPA's specifications. ESCO Institute (escogroup.org) administers its version of the exam and publishes its own preparatory manual; Mainstream Engineering and HVAC Excellence hold the same EPA approval. The 50 questions here are our own bank, verified against 40 CFR Part 82, not ESCO's; this site is not affiliated with ESCO. The EPA 608 certification online guide compares the approved online providers.
Open book mail in option: 84% instead of 72%
Some certifying organizations offer Core and Type 1 as an open book mail in exam without a proctor. Administered open book, the passing threshold rises to 84% (21 of 25 correct) from the 72% (18 of 25) required on the proctored, closed book exam. A Core section passed open book cannot be used toward Universal certification; Core must be taken as a proctored exam for Universal.
Expiry, retakes, and fees. Section 608 certification, including Type 1, never expires: EPA sets no renewal or continuing education requirement (EPA Section 608). If you fail a section, you retake only that section. Each organization sets its own fee: Mainstream Engineering charges $26.95 per attempt and $7.95 per retest, ESCO Institute $25 to $35 per section online proctored, HVAC Excellence $10 to $30 per section in person; the EPA 608 certification cost page lists every fee by organization.
Frequently asked questions about the EPA 608 Type 1 practice test
Is this EPA 608 Type 1 practice test really free?
Yes. All 50 Type 1 questions, scoring, and explanations are free with no signup. A free account unlocks the full 604-question bank with progress tracking; Pro ($14.99 lifetime) adds AI Tutor (1,000 questions/month), drills, and timed simulation.
What is Type 1 certification?
One of four EPA Section 608 categories: small appliances, factory sealed with 5 lbs or less of refrigerant, such as household refrigerators, window AC units, PTACs, and vending machines. Every section is on the EPA 608 practice test hub.
Does Type 1 certification allow me to purchase refrigerant?
Yes. Any Section 608 certification (Type 1, 2, 3, or Universal) allows purchase of refrigerant in containers larger than 2 lbs from EPA-registered distributors.
What refrigerants appear on the Type 1 exam?
Older CFC and HCFC refrigerants such as R-12 and R-22, HFCs such as R-134a, and hydrocarbons such as R-600a (isobutane) and R-290 (propane), which are factory-only substitutes in new household refrigerators and freezers under the EPA SNAP program.