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. 2022 May 10;219:109166. doi: 10.1016/j.buildenv.2022.109166

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Fig. 3 — A simple model of the continuum from short-range to long-range inhalation routes. (a) A simple jet model assuming the expired jet is steady (a1) or interrupted (a2); (b) The jet zone with a variable distance x in (a), and the room zone. The jet model may be modelled using the ideal steady jet model of (a1) and the two-stage jet model of (a2).