Pass Box is a closed steel box with a double door used for transferring the material from the nonsterile door to a sterile door inside the cleanroom. Scientist uses Air showers to pass through into the cleanroom where material uses pass boxes to get into the cleanroom. Pass through Box is cleanroom 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 cleanroom from airborne cross-contamination for a better research .

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