The critical field of patient care requires ultra clean, purified, medical air delivered to operating theatres and hospital beds with absolute reliability. A hospitals medical air supply is a vital life support service, maintaining respiration of the critically ill during mechanical ventilation. As such, within Europe, medicinal air is classified as a drug, and the concentration of impurities therein must be carefully controlled to ensure compliance with the European Pharmacopoeia monograph. The dMED purification system has been independently certified by SGS Belgium NV (Socit Gnrale de Surveillance) to provide medicinal air purification system and complying with the European Pharmacopoeia monograph. The results of the challenge test were obtained using a carefully controlled, highly contaminated inlet air supply, validating the dMEDs performance in the worst case scenario - extreme levels of environmental pollution.