A systematic review of fit improvement strategies for respirators: lessons learned from the COVID-19 pandemic

Among all, mask frame, ear loop strap modification, medical tape, thin dressings, double masking, and goggles donning modification are considered as pleasant FISs during performing the occupational activity. Among all, the mask frame and medical tape outperformed the other FISs. It is crucial that all respirators modified with FISs undergo standard fit testing procedures to avoid a false sense of security and prevent exposure to hazardous respiratory substances. Both safety and ergonomic factors are of great importance when applying each FIS.