nnp N95-electrocharged filtration principle based face mask design using common materials Figure 1

Figure 1: Cartoon representation of the three principles that N95 masks utilize. (a) The National Academies Press report from 2006 details three stages (Image credit: Institute of Medicine 2006. Reusability of Facemasks During an Influenza Pandemic: Facing the Flu. Washington, DC: The National Academies Press. https://doi.org/10.17226/11637.) whereas (b) the CDC webpage lists four principles, but we have subsumed interception principle listed by CDC within inertial impaction principle (Image credit: CDC webpage at https://blogs.cdc.gov/niosh-science-blog/2009/10/14/n95).