抄録
With the spread of COVID-19, respiratory protective devices are becoming more important as a means of preventing infection. Since the performance of respiratory protection mainly depends on how well the protection fits the wearer, it is important to quantitatively evaluate whether the protection is properly worn. The method of evaluating whether or not protective equipment is properly worn is called the fit test, and has been regulated by OSHA since 1998 in the respiratory protection standard（ 29 CFR 1910.134）. In 2019, a shortened protocol will be adopted that enables faster evaluation when using a fit test instrument by Condensation Particle Counter （CPC）. The CPC method is the mainstream of measurement method for quantitative fit test instrument, and we have developed AccuFIT9000 which is a fit test instrument by CPC in Japan. As a result of comparative evaluation with Porta Count according to ANSI standard（ Z88.10-2010 Annex A2）,it has shown that AccuFIT 9000 has sufficient performance for fit test. We have also shown that AccuFIT9000 PRO can perform the accurate fit tests for N95 mask. Regulations on respiratory protection have tended to be stricter in recent years, and fit test instrument is expected to become even more important in the future.
