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Fan has to be on to circulate air through the filters. Its very quiet. Low speed should be enough.
Sorry, there was a problem. Please try again later.Hello Nik, this is Kelly with Dyson. The HP04 does need to be turned on, either in fan or heat mode, to purify the air. You can use the machine at the lower airflow speed levels and still benefit from air purification. Best wishes, Kelly Dyson Customer Support
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