From what I know, this holds for air purifiers. Quantity of air moving through matters more than quality of the filter, because of re-circulation. The cool par

From what I know, this holds for air purifiers. Quantity of air moving through matters more than quality of the filter, because of re-circulation. The cool part of a PPS to me is that, because it is a one-shot system (no recirculation) it can actually take advantage of high quality filters.