Toxicity Class
The ASHRAE 34 letter denoting permissible exposure: Class A refrigerants have an occupational exposure limit ≥ 400 ppm; Class B are more toxic with a limit < 400 ppm (e.g., ammonia is a B refrigerant).
The ASHRAE 34 letter denoting permissible exposure: Class A refrigerants have an occupational exposure limit ≥ 400 ppm; Class B are more toxic with a limit < 400 ppm (e.g., ammonia is a B refrigerant).