COMMONLY USED NON-ODS SUBSTITUTE REFRIGERANTS 1. Global Warming Potential, WMO Scientific Assessment Report 2014; Report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee 2014 Assessment 2. A1 = Lower toxicity, no flame propagation (non-flammable); B1 = Higher toxicity, no flame propagation (non-flammable); A2 = Lower toxicity, flammable; A2L = Lower toxicity, lower flammability; B2L = Higher toxicity, lower flammability. 3. 2901.10 applies only if the concentration of is higher than 95%, otherwise 2711.13 (“Butanes”) applies.