Abstract
COVID-19 has created a shortage of N95 filtering facepiece respirators (N95 FFRs). The Centers for Disease Control and Prevention permit reprocessing and reuse of N95 FFRs in an emergency situation when new N95 FFRs are not available.1 A report indicated that reprocessing with 1 or 2 cycles of vaporized hydrogen peroxide (VHP) did not negatively affect the quantitative fit factor of model 1870+ N95 FFRs (3M) following a small-scale extended use/reuse experiment.2 In this letter, we extend that work to additional respirator models and additional VHP cycles, reporting that up to 22 VHP reprocessing cycles do not affect the quantitative fit of N95 FFRs.
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