Biosafety Cabinet Airflow Containment Simulator (2D)

Every Class II biosafety cabinet keeps aerosolised pathogens away from the operator using nothing but moving air: an inward face velocity through the open front sash, and a HEPA-filtered downflow that sweeps the work surface toward intake grilles. This simulator renders a real side cross-section of the cabinet and lets you drive the same three variables that determine whether that air curtain holds — blower speed, sash opening height, and HEPA filter loading — then release a burst of aerosol droplets at the work surface and watch each particle's fate resolve individually: swept to a grille and contained, or carried out through the sash into the room. Live readouts and a scrolling strip chart track the computed face velocity against the NSF/ANSI 49 compliance threshold of 0.5 m/s and the running containment rate across every burst you release.