When servicing an A2L unit, technicians should verify that the refrigerant cylinder being used is certified by _____ as safe to use with mildly flammable refrigerants. 

A halogenated refrigerant classification with a high ODP and no longer manufactured since 1995 describes _____. 

A refrigerant classification with a moderate ODP level but high GWP with a phaseout scheduled for 2030 describes _____. 

A refrigerant classification with zero ODP, very low GWP, and that is slightly flammable describes _____. 

A refrigerant that is classified as B3 has _____. 

match the refrigerants with the corresponding common use.  A. R-454A  B. R-407C  C. R-508B  D. R-600a  E. R-1233zd 

When refrigeration lubricant is found to be dark black in color, pungent in odor, and containing metal shavings, it is likely that the _____ failed. 

A partially halogenated refrigerant classification with zero ozone depletion potential (ODP) but high global warming potential (GWP) describes _____. 

True or False? Even though some refrigerants, such as R-12, are illegal to manufacture, only technicians who are EPA-certified may purchase small cans of R-12. 

A group of synthetic lubricants compatible with CFCs, HCFCs, and HFCs describes _____ lubricants.