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Introduction
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Characteristics of all Class II BSCs



  • Leak-tight construction

  • Require two HEPA filters
    • Supply filter
    • Exhaust filter


  • Airflow patterns
    • Clean (filtered) air flows down to the work surface
    • Downflow air splits 2"-6" (5cm - 15cm) above the work surface
      • Some to rear of front grille
      • Some to rear of cabinet
    • Intake air is drawn into the front of the front grille
    • Air leaves work area and is HEPA filtered prior to being exhausted or recirculated in the cabinet




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Generic schematic