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An air purifier is a device which removes contaminants from the air in a room. These devices are commonly marked as being beneficial for allergy sufferers, asthmatics as well as reducing toxic odors from indoors.  The commercially graded air purifiers are manufactured as either small standalone units or large units that can be affixed to an air handler.  Air Purifiers not only kill germs but also purifies the air and leaves behind fresh air to breathe.  It removes all kinds of foul smells within the environment of the house.  Air Purifiers could help prevent the development of many medical problems associated with air pollution. These include asthma, emphysema, allergies and cardiovascular diseases.