Disposable respirators cannot be disinfected, and are therefore must be assigned to only one person. Disposable respirators must be discarded if they are soiled, physically damaged, or reach the end of their service life. Replaceable filter respirators may be shared, but must be thoroughly cleaned and disinfected after each use before being worn by a different person, using the procedures in Appendix B–2 of 29 CFR 1910.134, or equally effective procedures recommended by the manufacturer.