Mann+Hummel's outdoor-air filter system gains global traction

摘要

Mann+Hummel reports that the use of its filtration systems for purifying outdoor air (Filter Cubes) could prevent the need for the imposition of vehicle bans in city centres. The nonwoven media within the Filter Cubes is based on a combination of a highly effective filter layer for trapping fine particles, and a special activated-carbon layer, which in tandem trap over 80% of the fine dust and nitrogen dioxide (NO_2) that pass through them. Owing to its large inner surface area, the highly porous activated carbon is able to absorb NO_2 efficiently and the use of a combined filter media enables a particularly high air throughput, with low energy consumption.The pollutants are retained using a number of different processes-physical adsorption, chemical binding and catalytic reduction.