2 ms·

The article mentions a HEPA filter.

• sudhirj 3y ago
  That’s still a mess, if the particles are magnetic a magnet will be a way cleaner and more effective filter.
  • sacnoradhq 3y ago
    Unfortunately, you're mistaken. In practice, iron(iii) oxide is barely paramagnetic and the particles are likely well above the Curie point and possibly at the melting point.