Claim: The HAZMAT Class 2 are gases classified in three divisions based on the United Nations' Recommendations on the Transport of Dangerous Goods - Model Regulations.
Evidence: Class 2 has three divisions: Flammable (also called combustible), Non-Flammable/Non-Poisonous, and Poisonous. This classification is based on the United Nations' Recommendations on the Transport of Dangerous Goods - Model Regulations. 
Gases are assigned to one of three divisions division 2.1 Flammable gas division 2.2 Non flammable, Non-toxic gas division 2.3 Toxic gas