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The PH04 has the formaldehyde filter. Neither humidifier is worth the price.
Sorry, there was a problem. Please try again later.Hi there, this is Kelly with Dyson. This is a great question! Both machines are ideal for larger spaces. The units will purify and humidify your air. They also both feature a fully sealed HEPA filtration system that traps allergens, gases, bacteria and smoke, and circulates purified air throughout the whole room. The PH04 is also capable of capturing and destroying formaldehyde, which is released from household items. We hope this helps. Best wishes, Kelly Dyson Customer Support
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