![]() It was shown that combining the above-mentioned ventilation and air cleaning can reduce aerosol particle concentrations with 80 to 90%, depending on aerosol size. Simplified mathematical models were engaged to provide further insight into ventilation, air cleaning and deposition. Air cleaning alone with ACH = 1.39 h −1 had a similar effect as ventilation alone. 4.5 times the minimum of the Dutch Building Code, was insufficient to stop the significant aerosol concentration rise over 30 min. The gym test showed that ventilation with air-change rate ACH = 2.2 h −1, i.e. Aerosol particle removal by mechanical ventilation and mobile air cleaning units was measured. A separate test was used to discriminate between human endogenous and exogenous aerosol particles. 35 test persons performed physical exercise and aerosol particle concentrations, CO 2 concentrations, air temperature and relative humidity were obtained in the room of 886 m³. This paper presents measurements of aerosol particle concentrations in a gym, where saliva aerosol production is pronounced. It can be assumed that aerosol particle concentrations should be kept low in order to minimize the potential risk of airborne virus transmission. ![]() These particles are generated when breathing, talking, laughing, coughing or sneezing. There is mounting evidence that it can also be transmitted by inhalation of infected saliva aerosol particles. SARS-CoV-2 can spread by close contact through large droplet spray and indirect contact via contaminated objects. ![]()
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