An air purifier is a device that filters out pollutants and other particles from the air inside a room. It works by running a fan that pulls the air through one or more filters. Typically, the filter is made of paper or fiberglass or an activated carbon material. The fan then blows the clean, filtered air back out into the room. Air purifiers should be placed in a location where the air intake is not obstructed by curtains or furniture. It is best to use them in the rooms where people spend most of their time, such as bedrooms.
The most popular type of air purifier is the HEPA based model. These filter out the most allergens, such as large dust particles and pollen. They also capture spores from mold and mildew. Air purifiers with carbon pre-filters are also effective in removing odors. The carbon is usually granular activated carbon (GAC) and to be effective it needs to be at least 3 pounds.
Many air purifiers have a UV-C light that is used to kill bacteria and other organisms in the air. This can be useful in areas where there is a risk of Legionnaires disease that is spread through airborne water droplets. Lastly some models have an activated charcoal filter that removes many gases. This is best for reducing odors and some chemicals, such as formaldehyde. It works well because it adsorbs the chemicals without creating harmful by products like ozone. air purifier