Figure 3.
Disappearance rate of Bacillus Calmette-Guérin in a model room without upper-room UVGI and with a 17-watt upper-room UVGI lampa,b
aOne AC corresponds to adding a volume of fresh air to the room equal to the volume of the room and equates to a removal of about 63% of airborne organisms in a perfectly mixed room. One AC produced with UVGI represents an equivalent AC and equates to inactivating about 63% of airborne organisms with UVGI in a perfectly mixed room.
bAdapted from: Riley RL, Knight M, Middlebrook G. Ultraviolet susceptibility of BCG and virulent tubercle bacilli. Am Rev Respir Dis 1976;113:413-8.
UVGI = ultraviolet germicidal irradiation
UV = ultraviolet
AC = air change
W = WaH
