Oxygen Deficiency 4 : Medicine. As defined by the regulatory authority for physiological effects. For certain respirators, refer to the minimum oxygen concentration where such devices may be used
Grainger, Inc. (Maintenance, Repair and Operating MRO), Glossary of Safety Terms, IL, USA 2012. www.grainger.com/images/GlossaryofSafetyTermsPDF.p df, (IndS/Maint, Repr and Opr - Amer) {79}