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[–] 13 points 1 year ago (1 child)

Should probably point out that "mm" in this case is micrometers, not millimeters.

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  • [–] 5 points 1 year ago

    Thank you for that clarification; I was genuinely wondering why anything smaller than 2.5 millimetres would pass through an air filter! When it comes to filtering air, 2.5 millimetres is MASSIVE

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