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Hello Peter, this is Kelly with Dyson. The TP07 Purifier Cool does have a filter; it would need to be replaced once the filter life has run out. With this machine, if you were to run that 12 hours every single day, you would get about a year of life from the filter. The TP07 offers 10 airflow speeds so you can set the airflow to any level desired. This model has been re-engineered to deliver 50% cleaner air, and the filter is made from 25% recyclable materials. It's also 20% quieter in operation, than previous purifier models we carry. Best wishes, Kelly Dyson Customer Support
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