European acronym for “Atmosphere Normale de Reference”. The ANR (Atmosphere Normale de Reference) is quantity of air at ambient conditions 1.013 bar absolute (= 1.033 kg/cm² abs), 20oC and 65% RH (Relative Humidity). The term ANR is not usually applied to cfm, it is the European term for FAD and usually follows the metric measurement of air flow, such as m3/min.