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A poorly ventilated classroom (1.2 l s-1 per person) has REI 2 suggesting that ventilation should be monitored in classrooms to minimise far field aerosol exposure risk. Scenarios involving high aerobic activities or singing have REI 1 ; a 1 h gym visit has a median REI = 1 . 4 , and the Skagit Choir superspreading event has REI 12 . Spaces with occupancy activities and exposure times comparable to those of the reference scenario must preserve the reference scenario volume flow rate as a minimum rate to achieve REI = 1 , i
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