The performance in either thermal comfort or infection control is unsatisfactory. In terms of infection control, it means the magnitude of the ventilation rate.
★★The performance is fair.
★★★The performance is acceptable, but compromise may be needed in terms of thermal comfort.
★★★★The performance is good in terms of both thermal comfort and airborne infection control.
★★★★★The performance is very good (satisfactory) in terms of both thermal comfort and infection control.

From: 5, Design and operation

Cover of Natural Ventilation for Infection Control in Health-Care Settings
Natural Ventilation for Infection Control in Health-Care Settings.
Atkinson J, Chartier Y, Pessoa-Silva CL, et al., editors.
Copyright © 2009, World Health Organization.

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