The Dual Filter is a combination of a HEPA H12 filter and an activated carbon filter. The HEPA filter removes pollutants such as fine dust, pollen, viruses and bacteria from the air while the activated carbon filter adsorbs gases (unpleasant odours, tobacco smoke, VOCs, etc.). The H12 HEPA filter is not as dense as the H14 HEPA filter which means that it can filter more air over the same period of time. The Dual Filter will need to be replaced every 8-12 months. Roger big requires two H12 Dual Filters.
