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. 2020 Dec 22;104(3 Suppl):12–24. doi: 10.4269/ajtmh.20-1128

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© The American Society of Tropical Medicine and Hygiene

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Figure 1. — Environmental ventilation (photos by Dr. Rebecca Inglis). (A) Large, open windows on two different walls improve natural ventilation. The wall-mounted extractor fan should be set to blow outward not inward. (B) A whirligig roof ventilator. The ventilator spins in the wind as warm air rises. The spinning draws out air from inside the building, improving ventilation. (C) Vented wall to increase airflow in a hospital corridor. (D) + (E) Two examples of split air system air-conditioning units in common usage and a ceiling fan. All three recirculate air within a room, rather than increasing the flow of fresh air from outside.