(See piston flow)

[AIVC, Air infiltration and ventilation glossary, 1992]:the concentration within a given portion of air of harmful or unpleasant contaminants such as noxious gases or dust particles. Concentrations are often expressed as time weighted values over 24 hours, a working day … Continue reading →

[AIVC, Air infiltration and ventilation glossary, 1992]:a measure of how effectively pollutant from an internal contaminant source is diluted and removed from an enclosure.(see also ventilation efficiency)