After the VI-2500 air purifier operates continuously for 15 minutes in a 25m³ room, the concentration of submicron particles in this room decreases by a factor of 6. The overall protection factor of a surgical mask, enhanced by the ionic purifier, is about 30 (this takes into account the finding that considerable improvement of the filter characteristics was partially suppressed by the leakage effect, see Phase 2 results). Thus, the number of submicron particles inhaled by a person is reduced by a factor of 6x30=180, instead of about 4 by a surgical mask alone. The air volume inhaled during a one-hour exposure is 1.8m³ assuming that the breathing rate is 30 LPM. Some examples are presented below. The green color indicates that the estimated number of bioagent particles is below ID50; the red color indicates that the estimated number is above ID50.

This is an excerpt from the latest confidential report on the VI-2500.
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