Background: During the early days of COVID-۱۹ pandemic, due to the shortage of N۹۵ respirators in hospitals and healthcare centers, the reuse of N۹۵ respirators was posed as a crisis capacity strategy. Several studies have evaluated the efficacy of various decontamination methods on N۹۵ respirators of well-known and approved brands. However, fundamental question is whether decontamination and reuse methods can be applied to all types of respirators. Methods: Six types of respirators were selected from well-known and lesser-known brands which their manufacturers claimed to be N۹۵. The selected respirators decontaminated with dry heat, ultraviolet germicidal irradiation, and ethylene oxide methods in seven consecutive cycles and their particle filtration efficiency and pressure drop were measured before and after each decontamination cycle. Results: As the initial measurements revealed, ۴ respirators (group A) showed a sharp drop in efficiency and also, negative efficiency in removing ۲.۵ and ۴ µm particles in most of the experiments. In these respirators (group A), the maximum efficiency in removing ۰.۵ µm particles was ۷۴.۴ %, while the last two respirators (group B) achieved an efficiency of ۹۸ %. Subsequent experiments following the decontamination process revealed that the non-authentic N۹۵ respirators within group A which were not resistant to decontamination. However, the second group demonstrated a removal rate of over ۹۵ % of particles ranging from ۰.۵ to ۱۰ µm after six consecutive decontamination cycles using all three methods. The results demonstrated that ultraviolet germicidal irradiation and ethylene oxide methods could eradicate the covid-۱۹ virus from respirators. Conclusion: The results indicated that decontamination can be successfully applied to original N۹۵ respirators, not low-quality respirators, even under critical conditions.

Keywords:

SARS-CoV-۲ , Respirator , Decontamination , Particle , N۹۵