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High-efficiency particulate air filters are used chiefly to

  • A.sterilize liquids that cannot be heated
  • B.detect airborne spores for monitoring
  • C.remove microorganisms from air entering a clean space
  • D.trap chemical vapours drawn into a fume cupboard

Answer: C

These filters trap the particles that carry organisms, delivering effectively organism-free air to operating theatres, safety cabinets and isolation rooms. They control the air supply and do nothing about surfaces or instruments.

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