Refrigerating machines are considered as dangerous goods for sea transport. Refrigerating machines may either contain non-flammable non-toxic gasses, ammonia solution or flammable, non-toxic, liquefied gas.
There are two entries for refrigerating machines in IMDG Code 39-18
UN 2857, Class 2.2 REFRIGERATING MACHINES containing non-flammable, non-toxic gases or ammonia solution (UN 2672)
& UN 3358 , Class 2.1 REFRIGERATING MACHINES containing flammable, non-toxic, liquefied gas
Exemptions are applicable to below
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