Comparing the effectiveness of negative-pressure barrier devices in providing air clearance to prevent aerosol transmission.

Abstract

PurposeTo investigate the effectiveness of aerosol clearance using an aerosol box, aerosol bag, wall suction, and a high-efficiency particulate air (HEPA) filter evacuator to prevent aerosol transmission.MethodsThe flow field was visualized using three protective device settings (an aerosol box, and an aerosol bag with and without sealed working channels) and four suction settings (no suction, wall suction, and a HEPA filter evacuator at flow rates of 415 liters per minute [LPM] and 530 LPM). All 12 subgroups were compared with a no intervention group. The primary outcome, aerosol concentration, was measured at the head, trunk, and foot of a mannequin.ResultsThe mean aerosol concentration was reduced at the head (p ConclusionsAs aerosols spread, an airtight container with sealed working channels is effective when combined with suction devices.