Fig. 2.

The influence of various parameters on the time-averaged intake fraction during a half day: (a) supply airflow rate, (b) schedule of lessons and breaks when the total length of either lessons or breaks is different (see Table 1 for detail), where NB denotes No Break or students staying in the classroom during breaks, (c) schedule of lessons and breaks when the total duration of lessons and breaks together is unchanged, (d) occupant density, (e) room height, i.e. of room volume, and (f) number of infected persons present in the room. Case 1 as shown in Table 1 was taken as the reference case and the percentages above the bars are percentage increases of intake fraction in comparison to this reference case.