Explained-HOW DOES AN AIR PURIFIER WORK?
Do air purifiers work?
The air inside our house can be two to five times more harmful than the air outside our house. It becomes very essential to purify the indoor air and here the air purifiers are of great importance.The working of an air purifier is based on the system of the internal fans which pull the air in your home through a series of filters. The air purifier then circulates the purified air back to the room. This process repeats itself several times an hour and this leads to a clean and healthy environment inside your house.Air purifiers trap dust, pollen and bacteria. There will be dust no matter what you do to keep your home clean. An air purifier traps the dust before it has the chance to settle leaving you with less to clean. Air purifiers remove up to percent of airborne bacteria. Small airborne particles like pollen, spores and other bacteria float in the air, causing your family to get sick. By cycling the air in the room repeatedly through internal filters, an air purifier helps remove major portion of airborne pollutants. This is how an air purifier works.
HEPA stands for High Efficiency Particulate Air. It is a technology that has been used for many years to filter particles. HEPA filters must meet a standard of trapping at least 99.97% of all particles larger than 0.3 microns. The working of an air purifier with HEPA follows the steps below:
- The HEPA filter is a very fine fibber-like material that has been folded back and forth to create the shape of an accordion.
- This accordion shape creates a maze of randomly arranged fibres and presents a very large surface for air to be pushed through by the air purifier fan. Airflow must have an opportunity to pass through the filter in order for it to be cleaned.
- The more times airflow passes through the filter in an hour, the cleaner the air will become. As the HEPA filter becomes full, air will no longer be able to pass through and a new filter will be needed; however a HEPA filter will typically last 2 to 4 years.
2. Activated Carbon Technology
The steps to understand how an air purifier works with activated carbon technology are as follows:
- Activated carbon is a form of carbon that has been processed so as to make it extremely porous and to give it a very large surface area for absorption.
- The use of activated carbon dates back to the early 1900’s when it was sold commercially to purify water and to take the colour out of sugar.
Activated carbon filters are comprised of many molecular sized pores that have high absorbent ability and chemical bonding. These properties make them a very effective tool for capturing pollutants such as chemical emissions, gases, tobacco smoke and odours. Once these pollutants are captured, they are not released back into the air, eliminating recontamination.
3. UV Technology
UV technology is most often used in conjunction with particulate filter systems since it doesn’t really get rid of airborne particles. It is however, an excellent method to kill germs such as bacteria and viruses. Air purifiers using this technology have a UV lamp installed and as microorganisms pass by the UV rays radiated from the lamp, cellular or genetic damage occurs, destroying the microorganism.
- A UV air purifier can convert molecules of oxygen and water found in your air into ozone and hydroxyl.
- The active molecules react with the air pollutants and destroy them into harmless components like water and carbon dioxide.
Although UV technology is effective at killing viruses and bacteria, it is best used with a filter system ahead of the lamps. Without a filter system, too many microorganisms get shaded from the light by particulates. Therefore, most air purifiers that employ UV start by filtering the air with HEPA and activated carbon and use the UV as a final stage of filtration.
4. Negative Ion
Negative ion air purifiers use chemical injections to clean the air. An ion is a natural particle with either a positive or negative charge. they get this charge be either gaining or losing an electron. Negative ions are simply oxygen atoms that have gained an electron.
- The negative ion simply takes the airborne particles out of the air and transfers them to walls and surrounding solid items in the room instead of completely eliminating them.
- When they are stuck to walls and other surfaces, they have the ability to become loose and re-circulate themselves back into the air.
- Therefore, the negative ion air purifier has not cleaned and eliminated these particles and there is still a good chance they will contaminate the air again.
Ozone air purifiers intentionally produce the gas ozone (O₃). Although many statements are made to make the public believe that these devices are safe and effective in controlling indoor air pollution, health professionals have refuted these claims. Exposure to ozone may ignite asthma symptoms and a high enough level can even scar the lungs.
Air purifiers work in such a way that they trap the dust particles and make the indoor air fresh for us. But at the same time it causes some of the pollutants which highly impact our environment. So it is necessary to invest in some air purifier and sanitizer which can do all the jobs naturally.