Figure 5.

A snapshot of the movement of one person in the corridor of a full-scale test room for a six-bed general hospital ward. The ward was ventilated by a downward supply system with exhaust at floor level. At the time of the experiment, the supply air stream was marked by smoke. A person walking forward at about 1 m/s would push a front layer of air creating a volume flux, F, of about 255 L/s, with an attached wake of 76–230 L behind (see main text for calculations). This introduces a significant mixing air flow into the room.