The PharmaGard NU-PR797 is a Positive Pressure Re-Circulating Compounding Aseptic Isolator that provides a sterile positive pressure work environment for the compounding of non-hazardous drugs. The NU-PR797 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. An additional filter assembly on top of the Isolator brings in HEPA filtered room air to assure the Isolators continuous positive pressure.