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 35-10

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

There are also exemptions in IMDG Code for Refrigerating machines.

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