1. Ken Largent Ken Largent United States says:

    So what I hear from you is that small round pegs are blocked by big square holes better because small round pegs don't travel in straight lines.

    What I gather from the article is that filter material intended to block "most" particles of a certain size are assumed to be effective against particles that are 2,000 times smaller.  Under his flawed logic, the material we use to keep flies out of our houses would also make great insulation material against the cold.

    Here is reality:  a filter material that is effective against particles of a certain size cannot be as effective against particles 2,000 time smaller.

    Even though there are masks capable of filtering out smoke particles, firefighters still use an oxygen source instead of masks because masks do not create oxygen in an oxygen depleted atmosphere AND there are other toxins besides smoke in a typical fire that a mask cannot filter out.

    The math says that particles that are 2,000 times smaller than the targeted substance are 200 times MORE likely to pass through the filter material than the "acceptable" 5 percent.

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