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information on the subway car dimensions I get about 5 cfm/person. To get <br />to 52 cfm/person the subway car occupancy should be reduced to 19 <br />people, that is, about one tenth of its designed capacity. <br />Ventilation system performance of the Louisville, CO library has been <br />given to me as 5000 cfm. Therefore, to maintain about 50 cfm/person the <br />occupancy of their building should be restricted to 100 people even though <br />its designed capacity might be as high as 500. <br />A building ventilation system may not perform equally in all rooms. <br />Where I work the newer laboratories have extremely good ventilation. <br />However, calculation has shown that the break -rooms may not have <br />adequate ventilation to support more than one or two people at 52 <br />cfm/person unless portable HEPA filtration systems are provided in those <br />spaces. <br />Glossary <br />aerosol A particle small and light enough to stay suspended in air for <br />minutes or longer: about 5 microns (0.0002") or smaller from human <br />respiration [14] . <br />ballistic "Moving under the force of gravity only (Oxford Languages)." <br />"Denoting or relating to the flight of projectiles after power has been cut <br />off, moving under their own momentum and the external forces of gravity <br />and air resistance (Collinsdictionary.com)." <br />ballistic particle A particle massive enough that gravity acts to causes it <br />to fall out of the air onto an object or surface. "The larger droplets follow a <br />ballistic trajectory irrespective of flow in the gas phase ... [15]." From human <br />respiration ballistic particles are larger than about 5 to 10 microns. <br />fomite "Objects or materials which are likely to carry infection, such as <br />clothes, utensils, and furniture" [Oxford Languages]. An infectious ballistic <br />particle which lands on an object makes the object a fomite. <br />5 <br />