To determine the appropriate safety measures for a specific flammable refrigerant, you should consult the refrigerant’s safety data sheet (SDS) and the relevant industry standards, such as IEC 60340-3-3 and ASHRAE 34. These resources provide information on the refrigerant’s classification, flammability risk, and recommended safety measures, including ventilation requirements, personal protective equipment (PPE), and emergency procedures. Additionally, you should conduct a risk assessment to identify potential hazards and develop a plan to mitigate them.