2. Coal filters absorb organic elements with a large molecular mass. The coal filter works great in combination with other types of filters, for example, with a pre -cleaning filter. However, independent work is ineffective. The coal filter is not able to absorb well folmaldehyde vapors or nitrogen dioxide, but remarkably copes with this task when working with chemosorbents (aluminum oxide, potassium permanganate). The most effective models of air cleaners with carbon filters of Philips and Honeywell. 3. HEPA (High Efficiency Particulate Arresting), which is translated from English, means a filter. The principle of operation is as follows: the air is driven through the filter with a fan, and dust particles settled on the surface of the filter. The advantage of this type of filter is the ability to delay particles with dimensions up to 0, 3 μm. This advantage allows you to use this filter not only in air cleaners, but also in vacuum cleaners. Air cleaners with this type of filter are perfect for allergies and suffering diseases of the upper respiratory tract.
