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The accuracy in CRE (absolute values) is presented in Figure 9, which are comparable to the uncertainty estimated by ASHRAE Standard 129-1997 on measuring air-change effectiveness in field-based measurements of [+ or -]0.
In practice, two indices of ventilation effectiveness are air-change effectiveness (ACE) and pollutant removal effectiveness (PRE).
In ASHRAE Standard 129 (ASHRAE 2002), the air-change effectiveness, designated with E, is defined and is twice the air exchange effectiveness, i.