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The Functions of Air Purifiers Between the air outside and inside a home, the air inside a home is much dirtier because of 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. This gives us an idea that the concentration of contaminants is greater inside the home and can affect the health of people who are prone to allergy or have respiratory difficulties, therefore, to address this problem, the homeowner must find measures to reduce the level of contaminants that may possibly be co-existing with them and using an air purifier is one way to lower the quantity of contaminants. Filters, such as air cleaners and HEPA filters; ionizing purifiers; ozone generators; with adsorbents; with UV light – all these are the types of air purifiers. 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. Using High Efficiency Particulate Air (HEPA) filters can help eliminate dust particles and allergens with sizes that are 0.3 micrometers or greater. A method called corona discharge which convert air molecules into ions is the main mechanism in ionizing purifiers and 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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Activated charcoal is a common adsorbent material which is installed together with the air purifier to take care of odors, fumes and chemicals, contaminants that are present in the air and because activated charcoal is extremely porous, 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.