I agree with Mark in another post. The idea that the Carrier Infinity is superior because it kills the bacteria and viruses on the filter is nonsense. While it probably does kill the bacteria and viruses, this is a great case of being factually accurate but irrelevant. The small amounts of bacteria and viruses on a filter are not going to be readmitted into the building when the filter is changed. Your kitchen dishcloth or sponge will have far more bacteria and viruses than an AC filter.