In many cases the same physical model may be used for multiple purposes in the wind tunnel. This can assist the project in both cost and timing. For example, a fully tapped pressure model may be used to explore the ambient pedestrian-wind conditions on and around a new project once the pressure data are collected. It could also be used to investigate the dispersion of noxious or ordorous gases from sources (say, laboratory fume cupboards, backup generators, kitchen exhausts, etc.) on the project. The MEL personnel can advise the design team about what can be done contemporaneously to minimise costs and delays.