The Air Purifier should have at the very least a HEPA Filter, UV Filter and Ionizer. Then once you have these it is how these three are tested/perform and the quality of each working together to clean the air. Tested Effectiveness for the highest performers are 98% or greater.
As discussed, you get what you pay for and to be honest, I have yet to see any of the SHARP models measure up in the independent tests.
Furthermore, I have owned one and could not qualify or quantify if it was actually working as there was no improvement in our health however this was not the case with Alen. It made a REAL difference immediately (2-3 days). From sore throats, coughing and nasal problems, all seemed to be cleared up.
I am not knocking SHARP AP's but after owning their top Plasmacluster Model from 2008, I was not convinced it was doing me any good.
Added on September 25, 2009, 9:36 am
Hello All, this was written by the MD for Alen Asia about HEPA and the other values of Alen and or other high performance Air Purifiers like IQ Air.
Even at the high end of the market with IQAIR & ALEN, Alen is leading the way in providing the absolute best and innovative product at affordable prices. Why would you settle for anything less! See below!
"I think most people need to realize that a good air purifier not only has HEPA but other technologies to remove various pollutants. What really sets Alen apart is we offer a multi-filtration technology I think this will answer most of your questions.
Also note that even in other air purifiers its not the HEPA filter that removes gases from our home but the other little known technologies that are incorporated in to a high performance air purifier like IQ or Alen and this is why different models / options are offered.
Alen filtration technologies can be turned on or off depending on what you're trying to achieve.
Our A375UV is best in class and only air purifier out there that can permanently remove a wide range of gases, volatile organic compounds, smoke, ammonia, etc.. Other gas air purifiers typically use carbon, which can be a problem because carbon stores gases which can be released at a later whereas our solution permanently eliminates the gas/odor on contact. Exclusive targeted technology was developed to address specific indoor air pollutants by PhD chemists and patented.
The A375UV includes UV-PCO(UV Photo Catalytic Oxidation) technology to reduce the levels of VOC's. The interaction of UV-C light and a permanent titanium dioxide (TiO2) grid serves as a photocatalyst to carry out hydrolysis (ie.to break water into hydrogen and oxygen). As TiO2 is exposed to UV light, it becomes increasingly hydrophilic; thus, it can be used reduce concentrations of airborne pollutants such as volatile organic compounds into harmless elements. Ya, we pack a lot of technology into our little air purifiers! As a safety feature, the UV-C lights and titanium dioxide grid are located on the inner most section of the A375UV.
UV Light (ultraviolet)
Our UV air purifiers have been tested to eliminate over 96%,
Ultraviolet light kills microorganisms by damaging the DNA. UV radiation disrupts the chemical bonds that hold the atoms of DNA together in the microorganism. If enough of these defects accumulate on a microorganism's DNA its replication is inhibited, thereby rendering it harmless. If the damage is severe enough, the bacteria cannot repair the damage and will die.
Bacteria are single cell microorganisms that exist everywhere. They are often 0.2 to 5 microns in diameter and most do not create an issue for people. But the ones that can present problems are pretty bad problems:
* Staphylococcus aureus are bacteria known to cause "staph" infections.
* Klebsiella pneumonia is a bacteria that can cause pneumonia.
* E Coli is a bacteria that is often associated with food poisoning but it also exists in the air and can affect the respiratory system.
NEW Silver Ion HEPA Filtration (Silver has been around for thousands of year and hopefully one of the answers to reduce swine flu)
The new Silver Ion HEPA filter eliminates up to 99% of bacteria, up to 50% of viruses that cause influenza and 99% of airborne allergens. The Silver Ion HEPA filter is coated with Silver Ion, which is antimicrobial. This keeps germs from developing inside the unit and prevents bacteria from being blown into the air. Silver Ion coatings greatly reduce the presence of fungi and bacteria within five minutes of operation. Through a process of denaturation and oxidation, the structure of the enzyme that produces oxygen gets detached and silver ion particles produce reactive oxygen in the air which works to destroy over 650 types of bacteria. Toxic to viruses and bacteria, silver ion is harmless to humans.
This is the same filter technology as recommended by the US Department of Homeland Security to remove harmful airborne particles in a terrorist threat. Tested at over 1,000% better than the leading ionic air purifier and up to 50% better than leading HEPA type air purifiers by the world's leading independent test.
We have more developments on the way but this should do for now. Thanks for you're question."
Pls provide me the website abt this alen Asia air purifier, I wld like to seek consultation if situation is allowed. my children recently r facing nose block and hv been hvg a night cough very often, almost feed him the doc medicine like a normal drinking water!