Mann+Hummel’s combifilter for vehicle interiors has been part of specialist field studies at the University of Heidelberg which have shown that the combifilter reduces the concentration of nitrogen dioxide in the vehicle interior by more than 90%.
To protect cabin occupants from harmful gases and unpleasant odours, the combifilter contains approximately 140 g of highly active activated carbon. This has a porous framework that covers around 140,000 m2 of inner surface area, comparable to the size of 20 soccer fields.
As soon as nitrogen oxides hit the activated carbon, some get stuck in the pores and are physically adsorbed there. Another part reacts with the humidity in the air, producing nitrous acid, which also remains in the filter. In addition, the toxic nitrogen dioxide is reduced to nitrogen monoxide in a catalytic reaction. This means that the Mann+Hummel particle filter can reduce harmful gases and unpleasant odours by more than 90% compared to a conventional particle filter.
The combifilter also blocks fine dust and the biofunctional filters retain most allergens and virus aerosols while the special coating prevents the growth of bacteria and mould.