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Air Filter Hub has air purifiers. Air Filter Hub’s air purifiers, also known as air cleaners and air purifiers, are products that can filter or kill air pollutants and effectively improve air cleanliness. Some air conditioners, heaters and other air conditioning equipment also have a limit of the air clean function. In 1823, John and Charles dean invented a new type of smoke protection device, which allowed firefighters to avoid the smoke when putting out a fire. In 1854, a man named John tenuous went one step further: he discovered that adding charcoal to an air filter could remove harmful and poisonous gases from the air. An air purifier usually consists of a system of fans and air filters, which work by circulating indoor air through a fan (also known as a fan) inside the machine.