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How much air we breathe? At rest about 500 liters per hour. Instead playing an intense physical activity five to eight times more. In a closed every liter of air contains a hundred million particles. This means that it inspired 50 billion per hour. In a normally ventilated room where people are moving, the air infinitesimal particles (smaller than a micron, a thousandth of a millimeter) remain suspended.
The air of the interior is polluted by dust, which contain substances harmful if inhaled. To prevent irritino eyes and airways, or that cause illnesses and fatigue, is important in addition to the usual air equip the house purifiers to maintain good air quality and thus to make the home environment healthier and more liveable .
Depending on the model may have:
the prefilter, which keeps only the largest impurities;
the electrostatic filter, which thanks to its electric charge holds even minute particles;
or the Hepa filter, a long-lasting and effective control of dust.
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