The PharmaGard NU-NR797 is a Negative Pressure Re-Circulating Compounding Aseptic Containment Isolator designed to provide a sterile negative pressure work environment for the compounding of hazardous drugs. The NU-NR797 Isolator creates HEPA filtered unidirectional flow supply at 20 air changes per minute within both the work zone and interchange areas to assure ISO Class 5 conditions. Utilizing unidirectional flow assures a continuous stream of HEPA filtered air across the work zone and interchange areas assuring sterility and minimizing cross contamination.