Pass box is used to transfer the material from lower cleanliness area to higher cleanliness area or vice-versa in classified area and also known as hatch. Pass box works as a barrier between two cleanliness level areas.
Pass boxes are of two types - A) Dynamic Pass box B) Static Pass box
A) Dynamic Pass box: Dynamic pass box works like an air lock or Laminar Air Flow unit. Clean air enters in the pass box and prevents the entrance of the contamination. Dynamic pass boxes may be Cascade, Sink or Bubble type similar to the airlocks in pharmaceuticals.
B) Static Pass box: Static pass boxes are simple boxes mounted between two areas and also known as passive pass boxes. Area having higher cleanliness level shall have higher pressure that helps to prevent the entrance of contamination in the sterile area.
Ultra-violet light is also installed in the pass boxes to remove the contamination that may enter during the transfer of material. It should be replaced after 1000 burning hours. Pass boxes should be cleaned with disinfectants at regular intervals.
Efficiency of the pass boxes should be verified by validation. Validation may be done by exposing the known population of the bacterial culture.
Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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