Standard 15-2019 - Safety Standard for Refrigeration Systems Standard 34-2019 - Designation and Safety Classification of Refrigerants ASHRAE's key standards for refrigerant identification and usage have been revised to meet governmental regulation and achieve improved performance. Standards 15 and 34 provide essential guidance to anyone who needs to stay current with new refrigerants and safety requirements. Standard 34 describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data, while Standard 15 establishes procedures for operating equipment and systems when using those refrigerants. ASHRAE offers the standards as a set. Available Now www.ashrae.org/15and34http://www.ashrae.org/15and34