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科学素养与生活应用·英语30篇(3)

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Why Air Filters Clean Indoor Air

Why Air Filters Clean Indoor Air

为什么空气净化器过滤室内空气

  1. Air filters trap dust, pollen, and tiny particles.
  2. They sit inside fans or HVAC systems.
  3. Clean air flows out while dirty air stays trapped.
  4. HEPA filters catch very small harmful things.
  5. People with allergies feel better with clean air.
  6. Filters need regular cleaning or replacement.
  7. Good indoor air supports health and focus.
  8. This is simple engineering for daily comfort.
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