Résumé
Objective To explore a method with good repeatibility, less interference factors and easily controllable experimental conditions for evaluating the filtering efficiency of air filters Methods This evaluating method referred to Standard Examination Method of Household Portable Electrically Powered Air Purifying Set of America(ANSI/AHAM Ac 1 1998) and used the index of the frequency of air filtration (TAF) in the determination.The required sampling space volumes and the sampling duration of testing were determined based on the related different of air capacities.The levels of CO,CO 2,inhalable particulate(IP),NO 2,SO 2 and total count of air bacteria in filtered air were determined Results IP and total count of air bacteria could be used as sensitive indexes for evaluating the efficiency of air filtration Conclusion This method avoided many interference factors.It presented shorter duration of examination,good repeatibility and stability,easy operation and acturally reflected the efficiency of air filters