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How Air Purifiers Work The air inside a home is much dirtier than the air outside due to the presence of the following: contaminants, such as mold and mold spores, which were created from the existing moisture inside the home; dust particles and bacteria coming from forced-heating and cooling systems; pet fur and dander; if there are smokers in the family, the toxins are into the air; pollen and outdoor allergens can be blown in from outside through the doors and windows and can land on the carpet and upholstery. Now it is clear why people who stay more at home are more prone to allergy or have frequent respiratory difficulties due to the concentration of contaminants inside the home, therefore, the homeowner must find measures to reduce the level of contaminants using an air purifier. There are many types of air purifiers, such as filters, such as air cleaners and HEPA filters; ionizing purifiers; ozone generators; with adsorbents; with UV light. Air purifiers that have filters are known as air cleaners and they are installed usually into two areas in the house: as part of the heating or cooling system of the home or they are installed between the air return duct and the furnace or placed into the air return vents in every room of the house. Foam, cotton, fiberglass or synthetic fibers are some of the examples of filter materials and choosing among them a denser type of material is effective in catching smaller size air particles. The High Efficiency Particulate Air (HEPA) filter which is designed for filtering air particles of 0.3 micrometers in size is useful in filtering out allergens and dust particles. Ionizing purifiers work with a corona discharge which convert air molecules into ions and the concept behind is that since the air is neutrally charged, when it passes through the ionizing filter there will be an ionization of air molecules, such that large particles in the air, like dust and contaminants, are more prone to be ionized and will be separated from the rest of the components in the air.
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Ozone generators may follow a similar concept as that of ionizing purifiers, but differ in the sense that instead of ionizing air molecules it converts them into ozone, a molecule made up of three oxygen atoms, thereby eliminating some of the oxygen components in the air which may be considered as contaminants and , at the same time, manufacturers claim that ozone generators deodorizes and disinfects the air.
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Many air purifiers make use of adsorbent materials, such as activated charcoal, to take care of odors, fumes and chemicals, contaminants that are present in the air, and the principle behind using activated charcoal is that this adsorbent is extremely porous and it is effective in trapping passing air molecules so that large size particles of contaminants are stuck into the adsorbent pores, working effectively into two ways, filtering the contaminants and adsorbing them into the filter at the same time.