Which toxicity classification is for refrigerants with an OEL less than 400 ppm?

The toxicity classification for refrigerants with an Occupational Exposure Limit (OEL) of less than 400 ppm is indeed classified as Class B. This classification pertains to substances that can be hazardous to human health and suggests that they should only be used in well-ventilated areas where exposure can be controlled.

Class B refrigerants are considered to have a moderate level of toxicity compared to Class A and Class C materials. Class A refrigerants typically have an OEL greater than 400 ppm, indicating lower toxicity. Class C refrigerants are usually defined as those with more stringent exposure limits or higher toxicity. So, the classification of Class B indicates a level of caution and awareness needed when handling these refrigerants, as exposure to concentrations below this threshold still requires careful monitoring for safety.

This classification system is important for ensuring that safety practices in the use and management of refrigerants are clearly understood and adhered to in order to protect workers and the environment.