Paper and cloth masks block 5 microns and larger.
N75s block 3 microns and larger.
Aerosolized virus (non chunky) is 0.0125 microns.
Math is always expert in Gnus Studios.
Do the effing math.
Air filter grades are determined by ISO 16890, which is the current international standard for testing air filters for ventilation systems in the food and beverage industry. It replaced BS EN 779:2012 on 30th June 2018. The test method represents real-life performance much more accurately than previously and the filter classification system (based on particulate matter efficiency or ePM) is much more transparent. Furthermore, for the first time, the same filter classifications are used globally.
https://www.hvds.co.uk/air-filter-information/air-filter-classifications/
Goodell has his own "ref" staff on the field. Two "managing desks" East and West coasts. Freely admitted.