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Our Exclusive Data Reveals the Best Air Purifier for Preventing Sickness During Cold and Flu Season
- CNET's exclusive lab data identifies the Shark HP232 as best for continuous low-speed particle removal.
- Coway Airmega 400S shines at high speed for rapid removal when someone is sick.
- Experts say continuous low-speed operation helps prevent illness by keeping background aerosols low.
- High-speed bursts are useful after coughing or sneezing but should not replace baseline filtration.
- A true HEPA filter and proper unit placement remain key factors for illness prevention.
- Placement guidance recommends keeping purifiers in rooms where people spend the most time and away from walls.
- The report notes sensors may not detect tiny aerosols that carry viruses.
- Experts recommend 3–5 minutes for 90% removal of fine particles as a practical benchmark.
- The report identifies top performers across price ranges, including devices like the BlueAir 311i and Oransi Mod Plus.
- Overall guidance: continuous operation is key, with higher speeds used selectively when someone is ill.
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