Like room or system ventilation effectiveness, variable loads, dynamic However, 2 ACH prevents design considerations It is simple, consistent, and easy toĬalculate and enforce. "exchange the volume of air twice per hour" (Muir 1879), ergo: Historical sources talk about providing means to To keep the air smelling sweet" (Nightengale 1859).īy the 1870s and 1880s, architects added ample window area in Writes about the smell of the wards, and urged "enough ventilation Nightingale demanded reform in patientĬrowding and sanitation. Sheįamously pointed out, soldiers' chances of dying were higher in the She found they were dirty and dangerous places. In the 1850s, Florence Nightingale visited the military hospitals Over 140 years ago, architects and engineers started using 2 airĬhanges per hour (ACH) as a basis of outdoor air ventilation in hospital APA style: Proposed outdoor air ventilation rates for health care facilities.Proposed outdoor air ventilation rates for health care facilities." Retrieved from 2017 American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. MLA style: "Proposed outdoor air ventilation rates for health care facilities." The Free Library.
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