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Hi Dave, this is Kelly with Dyson. The filter for the TP01/TP02 is out EVO 1-piece filter. The TP04 has a 2-piece filter, which consists of sealed HEPA and activated carbon filters. Regardless, both will purify in the same manner, and remove 99.97% of allergens and pollutants as small as 0.3 microns. Best wishes, Kelly Dyson Customer Support
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