![]() ![]() Removal times will be longer in rooms or areas with imperfect mixing or air stagnation. However, perfect mixing usually does not occur. The times given assume perfect mixing of the air within the space (i.e., mixing factor = 1). However, certain diseases (e.g., infectious tuberculosis) are not likely to be aerosolized at a constant rate. Other equations are available that include a constant generating source. With a person present and generating aerosol, this table would not apply. ¶ Values apply to an empty room with no aerosol-generating source. T2 – t1 = – X 60, with t1 = 0Ĭ1 = initial concentration of contaminant + Denotes frequently cited ACH for patient-care areas. * This table is revised from Table S3-1 in reference 4 and has been adapted from the formula for the rate of purging airborne contaminants presented in reference 1435. The number of air changes per hour and time and efficiency. Air changes/hour (ACH) and time required for airborne-contaminant removal by efficiency * Filter efficiencies for central ventilation and air conditioning systems in psychiatric hospitalsġ. Filter efficiencies for central ventilation and air conditioning systems in nursing facilities Filter efficiencies for central ventilation and air conditioning systems in outpatient facilities Filter efficiencies for central ventilation and air conditioning systems in general hospitals Pressure relationships and ventilation of certain areas of nursing facilities Ventilation requirements for areas affecting patient care in hospitals and outpatient facilities ![]() Air Sampling for Aerosols Containing Legionellae.ACH and time required for airborne-contaminant removal by efficiency ![]()
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