Find out which masks off the most protection and why
In the US, FFP respirators are classified by the National Institute for Occupational Safety and Health in terms of the percentage of particles they filter out. Thus, N95 and N99 masks filter out 95% and 99% of particles respectively, while N100 devices eliminate 99.97%.
"There you have a more comprehensive solution. There's a hood face shield and a tube that would connect into a unit on the belt," says Brian Hovey, chief marketing officer for major respirator manufacturer Honeywell Safety."That has an engine or a motor that pumps air through a filter: it's part of a white suit, so it's a more comprehensive protective solution."
The testing process involved both a smell test to see whether the wearer could detect outside smells, as well as a physical test of whether tiny particles are indeed filtered out. The British Standards Institute is currently evaluating the device against European standards, after which, hopes the team, it can be used more widely at Southampton and elsewhere.
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