Cargo heaters are generally prohibited in cargo space that contains any of the following EXCEPT:

There are special cargo heater rules for loading:
- Class 1- Explosives
- Division 2.1 - Flammable Gas
- Class 3 - Flammable liquids
The rules usually forbid the use of cargo heaters, including automatic cargo heater/air conditioner units. Unless you have read all the related rules, do not load the above products in a cargo space that has a heater.