Games-Howell test by 95% concurrent confidence intervals.

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Schematic diagram of the cartridges and PFF2 respirators efficiency...

Statistical process control chart of the efficiency of PFF2 respirators...

Mobile range chart of the efficiency of PFF2 respirators obtained by...

Histogram with null hypothesis (Ho) and 99% confidence interval....

Evaluation of the efficiency of chemical cartridges for respiratory protection against SARS-CoV-2

Article

Full-text available

Mar 2022

José D. Paiva
Paulo Correia da S. Neto

The shortage of PFF2, N95, KN95, and FFP2 respirators in the COVID-19 pandemic required that alternative respiratory protection measures be adopted to reduce the number of cases of the disease. Given this scenario, with the purpose of proving that chemical cartridges offer some degree of protection against aerodispersoids, among these those of biol...