Are Air Purifiers Still Effective for Virus Protection Even When Windows are Open?

Data shows that air purifiers can still filter out particles such as viruses when the windows are open. The following points should be considered when using air purifiers to filter out airborne contaminants such as viruses, while keeping windows open:

  1. Increasing ventilation (for example by opening windows) is the recommended approach by the US CDC to reduce virus transmission.
  2. Air purifiers are recommended as a supplementary tool to reduce airborne contaminants including viruses in the home [1].
  3. In poorly ventilated areas, or where opening windows does not create enough air circulation, air purifiers can help to increase the equivalent air circulation in your home, school or other space.
  4. The air purifiers should be placed in the areas of the room with poorest ventilation. Typically those furthers away from the windows or other air circulation systems. This will maximise the ventilation in the space, increasing the equivalent ventilation.

Learn more: Can air purifiers work with the windows open?

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