BIO SAFETY CABINET — CLASS II, A2 — AIRFLOW PATTERN

    Blue — Room Air                                    Pink — Contaminated Air under positive pressure

 Green — HEPA Filtered Air 70%        Dirty Green — Potentially Contaminated Air

   Grey — Exhaust Air                     Green-Brown — Contaminated Air under negative pressure

 BIO SAFETY CABINET — CLASS II, B2 — AIRFLOW PATTERN

    Blue — Room Air                                     

 Green — HEPA Filtered Clean Air          Dirty Green — Unfiltered/Potentially Contaminated Air

   Grey — HEPA Filtered Exhaust Air    Green-Brown — Contaminated Air under negative pressure