How are refrigerants with a higher toxicity level labeled?

Refrigerants with a higher toxicity level are labeled with the letter "B." This labeling scheme is part of the ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) classification system for refrigerants, which categorizes substances based on their toxicity and flammability.

In this classification, the letter "A" is used for refrigerants that are considered to have lower toxicity, while "B" is assigned to those with higher toxicity, indicating that they pose a greater risk in the event of a leak or exposure. This system is crucial for ensuring safety in the handling, storage, and use of refrigerants.

Understanding these classifications helps HVAC professionals make informed decisions regarding the selection and management of refrigerants in various systems and applications, emphasizing safety and compliance with industry standards.