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Pass Box is a closed steel box with a double door used for transferring the material from nonsterile door to sterile door inside the clean room. People uses Air showers to pass through into the clean room where material uses pass boxes to get into the clean room. Pass through box is clean room equipment designed in two categories one is a static pass box and the other is a dynamic pass box. Pass boxes provide a controlled environment to the clean room from airborne cross-contamination for a better research environment.