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Hi there, this is Kelly with Dyson. The Dyson Purifier Hot + Cool Formaldehyde HP09 features our most advanced filtration system, which combines a precise, solid-state formaldehyde sensor with a unique catalytic filter that continuously destroys formaldehyde. The activated carbon filter removes gases and odors in your air, and the HEPA filter captures 99.97% of particles 0.3 microns in size. Best Wishes, Kelly Dyson Customer Support
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