What is the ASHRAE classification for ammonia as a refrigerant?

Ammonia, when classified by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), is categorized under the B2 classification. This classification indicates that ammonia is considered a mildly toxic refrigerant that can pose health risks in the event of a leak, as it has a lower toxicity threshold compared to refrigerants labeled as A1 (which are non-toxic) and C3 or D4 (which are classified as highly toxic or flammable).

Understanding the implications of these classifications is crucial, especially in settings where safety is paramount, such as in handling and storing refrigerants. The B2 classification highlights the need for appropriate safety measures when working with ammonia to prevent inhalation and exposure risks, indicating its potential to cause adverse health effects at exposure levels below those of more toxic refrigerants.

The classification system serves as an important framework for making informed decisions regarding safety protocols, training, equipment use, and emergency procedures in environments where ammonia is utilized.