How do Air Purifiers Work


If you want to know how Air Purifiers work, then take a quick look through this post that covers various types of different Air Purifiers and their systems of operation. Typically, the air inside the typical home is generally quite polluted as compared to air outside. This is because there are many pollutants in the house and often the doors and windows are closed so there is very little exchange of fresh air in the house. The indoor air is often having more moisture and that can lead to mold and spores.

Heating and cooling systems with forced air circulation spread dust particles and bacteria throughout the house. Pets shed hair, fur and dander, smoke pollen and dust remain circulating in the house. This polluted air is not very harmful for a healthy person, but children and people with allergies and respiratory difficulties can experience ill effects. Air Purifiers when used correctly remove a large quantity of air pollutants and make the indoor air healthier.

How do Air purifiers work? Well, there are various types of Air purifiers and each work differently but are effective in reducing the pollutants from indoor air making it much cleaner and healthier.

Here are various types of Air purifiers and the way they work:

1. Air Purifiers with Filters

One of the simplest Air purifiers are based on principle of passes the air through a filter. The filter removes the particles of pollutants from air and the passes clean air in the room. Most heating and cooling systems that have forced air circulation system also have some kind of filter before the air is forced back in the room. The filter can be made of synthetic fiber mesh, foam, cotton or fiberglass. However, the density and pore size of the filter determines the size of particles that can be removed from the air.

To obtain really good air quality requires HEPA (High Efficiency Particulate Air) filters that meet a high standard of efficiency.  The filter can consist of any material as long as it meets this standard -- penetration of less than 0.03 percent of particles 0.3 micrometers in size or larger. The filter must also allow a specific amount of air to flow through, which varies by the size of the filter.  This standard normally cannot be met by standard filters of the air cooling and heating systems of the house.

Therefore, specialized stand-alone Air purifiers with HEPA filter are required. These units are simple devices with an air blower pushing air through a HEPA filter. The air coming out of these Air purifiers are much cleaner as it removes almost all particulate pollutants from the air. However, the HEPA filters require frequent cleaning as their efficiency decreases as the filter clogs. Some of these filters have to be replaced quite frequently.

2. Ionization Air Purifiers

Ionization Air purifiers generate charged molecules called ions. By creating an electric field resulting in a corona discharge, these devices ionize the normally electrically neutral molecules. The particulate pollutants become charged either positively or negatively. Once a particle is charged, it will be attracted to anything with the opposite charge.

Two metal plates within the Air purifier are charged (one negative, one positive) to attract these particles. These charged particles in the air are attracted to each other and they clump together thereby become heavier and then settle down in the base of the device, thereby removing it from the air. The clean air is pushed out into the room.

3. Ozone Generators

An Ozone Generator Air purifier works by producing Ozone gas. Ozone is simply a molecule with three atoms of Oxygen. It uses electric arc to ionize Oxygen molecules so that they combine together to combine three atoms of Oxygen into a single molecule called Ozone. Ozone has quite different physical and chemical properties and can interact with bacteria and destroy it.

It has a powerful disinfectant effect. However, Ozone is also known to be a toxic gas. It is not a very stable molecule -- it reacts readily with other chemicals that may be in the air, forming new compounds that can be more dangerous than the ozone itself. Ozone also oxidizes metals and causes corrosion. So, it is not generally recommended to clean the room air with Ozone producing device.

4. Air Purifiers with Adsorbents

Some Air purifiers use an adsorbent material in addition to a filter. This removes many odors, fumes and chemicals from the air.  Adsorption is the process of one substance being trapped on the surface of another substance. The most common adsorbent is activated charcoal, which is extremely porous and has the ability to trap many types of pollutants when used as a filter in an Air purifier. This is a safe way to clean the air and the only drawback is frequent replacement of charcoal filter.

5. Ultra Violet Light Air Purifiers

Ultraviolet radiation has the ability to break down certain micro-organisms and make them sterile and harmless. As air passes through these Air purifiers which has a UV light source, all the bacteria in the air are killed and air that comes out of the Air purifier is free from all bacteria.

In addition, feel free also to view a selection of Popular Air Purifier stock levels by clicking on any of the images provided below…

Finally, it would be greatly appreciated by the community if you can share your own experiences of Air Purifiers by leaving a comment in the comment box below – So that other people in the community can learn also!

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