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?:abstract
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Reliable indoor air disinfection could make clinical and other necessary indoor spaces safer during epidemics with airborne transmission like COVID-19. Low-dose upper-room germicidal ultraviolet-C (GUV 254 nm) is well-suited for this because of the SARS-CoV-2 virus\' sensitivity to GUV inactivation and GUV\'s relatively easy adaptability to many types of indoor spaces without respect to outside weather conditions. However, most existing upper-room GUV fixtures are relatively expensive and inefficient at creating an upper-room disinfection zone due to loss of disinfecting UV-C photons caused by the casing and louvers designed to protect persons in the occupied space. Presented herein are two moderate-size restaurant spaces, 900 ft2 (25.5 m3 ) and 630 ft2 (17.8 m3 ) respectively, in which low-cost bare-bulb GUV fixtures, without exterior casing, were installed with upward-pulling ceiling fans to provide upper-room disinfection and lower-room safety. Proper safety-tested installations like these are adaptable to hospital Emergency Department waiting rooms, clinics, nursing home and prison common areas, public libraries, schools, and restaurants.
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