0 inHgVacuum target — high/medium-pressure equipment under 200 lb (current)
4 inHgVacuum target — high/medium-pressure equipment 200 lb and over (current)
25 mm HgVacuum target — low-pressure appliances (current)
90%Recovery — small appliance, compressor working (current)
80%Recovery — small appliance, compressor not working (current)
4 inHgVacuum target — small appliances (Type I)
30 daysTime to BEGIN substantial leak repair
12 monthsTime to COMPLETE the repair
50 lbCharge threshold for leak-repair rules
3 yearsService record retention
70%Exam passing score (84% open-book Type I)
15 psigHigh- vs low-pressure boundary (Types II/III)
5 lbSmall appliance charge limit — 5 lb or less (40 CFR 82.152)
80% / 90%LEGACY recovery rule (<200 lb / 200 lb+) — prep banks still test it
500 µmDeep vacuum before opening line sets (NATE)