CONTINENTAL EDISON CERTT91W Guide D'utilisation page 47

Information:
This appliance contains isobutane (R600a): isobutane is a natural gas
with low environmental impact. It must nonetheless be used with caution
as it is a flammable substance. For this reason, make sure the
refrigeration circuit pipes are not damaged.
Environmental class Ambient temperature (°C)
N
ST
Between 16 and 32
Between 16 and 38
45