Research Article: Natural Ventilation for Prevention of Airborne Contagion: Conclusions Overgeneralized

Date Published: May 29, 2007

Publisher: Public Library of Science

Author(s): Hal Levin

Abstract: None

Partial Text: This article and editor’s summary give the impression that the tuberculosis infection rate was actually reduced by opening windows [1]. A careful reading of the article clearly states that while ventilation rates were measured, infection rates were merely calculated using the Wells-Riley equation. This is old news. While it is important to take into account the adequacy of the ventilation rate provided by mechanical ventilation systems, the ventilation rate through open windows is a function of window size, number, and location in a room as modified by indoor–outdoor temperature differences and wind direction and velocity.



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