This research aims to characterise ultrafine particle distribution in an office, by investigating printers and air supply units as potential sources of indoor particles. Ultrafine Particle number concentrations, as well as office characteristics such as temperature and airflow were analysed using the computational fluid dynamics (CFD) method and standard k-ε model. Our findings suggest that reasonable estimates of indoor ultrafine particle number concentration can be made by considering at both indoor and outdoor sources. It was found that the greatest ultrafine particle number concentrations were not necessarily found at locations closest to the indoor particle sources and that the concentrations close to the air inlets also displayed significant particle concentrations. Conversely, at points far away from the airflow inlets (in the corners of the room), ultrafine particle number concentration was somewhat higher, as a result of poor airflow circulation, which failed to circulate these particles for removal at the outlet
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