Respiratory Protection Effect of Ear-loop-type KF94 Mask

Ear-loop-type Korean Filter 94 masks (KF94 masks, equivalent to the N95 and FFP2) are broadly used in health care settings in Korea for the COVID-19 pandemic. However, no studies have assessed the adequacy of respiratory protection. In this prospective randomized open-label study, the investigators aimed to evaluate the fitting performance of ear-loop-type KF94 masks by the quantitative fit test according to the occupational safety and health administration (OSHA) protocol. In addition, by quantitatively comparing the "tight-fitting" method using a clip and the "general-fitting" method, the investigators tried to evaluate whether the tight-wearing method improves the fitting performance of KF94 masks.