ASE AC 609 CERTIFICATION REVIEW SET
2026 ANSWERS GUARANTEED PASS
⫸ class 1 substance Answer: ozone depleting chemical with an ozone
depletion potential greater than .2 (eg CFCs)
⫸ class 2 substance Answer: ozone depleting chemical with an ozone
depletion potential less than .2 (eg HCFCs)
⫸ CFCs Answer: Chlorofluorocarbons, eg R-12 (CFC-12)
⫸ HCFCs Answer: Hydrochlorofluorocarbons, eg R-22 (HCFC-22)
⫸ HFCs Answer: hydrofluorocarbons, eg R-134a (HFC-134a)
⫸ HFOs Answer: Hydrofluoroolefins, eg R-1234yf (HFO-1234yf)
⫸ mvac Answer: Motor Vehicle Air Conditioner
⫸ MVAC-Like Appliances Answer: an appliance similar enough to an
mvac that one does not need a 608 certification (eg tractors, buses, and
construction equipment. DOES NOT INCLUDE: refrigerated trailers,
boats, trains, and aircraft)
2026 ANSWERS GUARANTEED PASS
⫸ class 1 substance Answer: ozone depleting chemical with an ozone
depletion potential greater than .2 (eg CFCs)
⫸ class 2 substance Answer: ozone depleting chemical with an ozone
depletion potential less than .2 (eg HCFCs)
⫸ CFCs Answer: Chlorofluorocarbons, eg R-12 (CFC-12)
⫸ HCFCs Answer: Hydrochlorofluorocarbons, eg R-22 (HCFC-22)
⫸ HFCs Answer: hydrofluorocarbons, eg R-134a (HFC-134a)
⫸ HFOs Answer: Hydrofluoroolefins, eg R-1234yf (HFO-1234yf)
⫸ mvac Answer: Motor Vehicle Air Conditioner
⫸ MVAC-Like Appliances Answer: an appliance similar enough to an
mvac that one does not need a 608 certification (eg tractors, buses, and
construction equipment. DOES NOT INCLUDE: refrigerated trailers,
boats, trains, and aircraft)