Existence of a Nonzero Worst-Case ACH for Short-Term Exposure in Ventilated Indoor Spaces

Figure 7

Risk of infection obtained as a function of ACH for separations of , , , and for overlap times of  min for (a) room 1 and (b) room 6 and  min for (c) room 1 and (d) room 6 ( quanta/h;  m³/h [31]). All cases display a peak highlighting the worst value of ACH. The yellow bands depict a realistic range of ACH values in rooms 1 and 6. The orange bands depict the range of minimum ventilation rates prescribed by ANSI/ASHRAE Standard 62.1 (2022) for an occupancy of (a, c) 30 in room 1 and (b, d) 8 in room 6.

(a)

(b)

(c)

(d)