An air purifier can also be referred to as an air cleaner. It is a device that can remove contaminants from room air. These are devices which are marketed widely, and they are said to be very beneficial to people who suffer from asthma and allergies. The purifiers also eliminate or reduce second hand smoke from cigarettes.

Air purifiers are manufactured as large units that can be combined with air handlers and they can also come as small standalone pieces. The air purifiers are also used in industries so as to remove any impurities before processing begins. Different absorption techniques are used for this purpose.

The benefits of air purifiers

Dust, mold spores, pet dander, and pollen are allergens. They may cause allergies in human beings, especially those who are sensitive. Volatile organic compounds and smoke particles pose a great risk to humans as well. Exposure to the different components may make one sick. An air purifier aid in removing such elements from the air we breathe, thus reducing the incidence of disease.

Techniques used

Passive and active are the purifying technologies that we have. In active technology, ionization is used to clean the air while passive units use filters to eliminate pollutants. These are much more effective because the particulate and dust matter is removed completely from the air.

There are different processes that can be used to purify air. They vary in effectiveness and so one needs to choose wisely depending on the needs that they have. Some of the processes include:

  • Thermodynamic Sterilization

This is a technology where heat sterilization is used through a ceramic core that has micro capillaries. This is a process that removes most of the unwanted materials form air.

  • Ultraviolet Germicidal Irradiation

This is used to sterilize the air, which is passed through the UV lamps and then a fan is used so as to force the air to pass UV light. There are other systems that can be installed so as to move micro-organisms through the lamps.

  • Filter based Purification

This is where airborne particles are trapped by size and then excluded. Air is usually forced through the filter and the particles get physically captured.

  • High Efficiency Particulate Arrestance

In this method, around 99 percent of particles are removed. Such a filter is installed in such a way that no air enters a clean room without passing through it.


Usually, rating of the air purifiers is done based on different factors. This includes the rate at which clean air is delivered. This in a way determines just how well air has been purified.

It is also done based on how efficient the area is covered as well as the changes of air per hour. Energy uses and how much replacement of filter costs are yet others ways of rating an air purifier.

There are other factors that need to be considered, including how long the filters last as well as the amount of noise that is produced. Most of the information can be provided by the manufacturers.