The flammability characteristics of A2L refrigerants are important to understand when evaluating equipment design and servicing considerations. A2Ls are composed of a variety of chemical components, including those with high hydrofluoroolefin (HFO) content; pure HFOs; pure hydrofluorocarbons (HFCs); and various blends of the two. As a result, flammability ratings will differ among each individual refrigerant. With a lower flammability classification than R-290, mildly flammable A2Ls have less intense flammable characteristics and are less likely to ignite. For more information about the safe application of A2L refrigerants download our recent article on A2L refrigerant equipment safety and servicing best practices.