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Hi Billy, this is Kelly with Dyson. The filter for your PH04 should last roughly 4400 hours. If the purifier is ran 12 hours every single day, the filter would last roughly one year. Best wishes, Kelly Dyson Customer Support
Sorry, there was a problem. Please try again later.The machine should tell you when it’s time to actually replace the filter. But it’s recommended every 12 months. Just follow the cleaning cycle throughout the year to get the most use of the filter. The filters are around $79.99.
Sorry, there was a problem. Please try again later.It’s strongly recommended that you download the app and connect the device to the app. It will be able to tell you in the app when it needs to be replaced. As some air is cleaner than some places, and room sizes vary, the best way to know when to change is when the fan tells you.
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