Onemorething is not an agent but the MD for ALEN in SE ASIA. The ability to bring Premium Air Purification at an affordable price to consumers does not support using agents and as you commented can sometimes be MISLEADING with their limited knowledge and motivation.
It is refreshing to see a blogger who knows the industry standards I might add.
To comment on the above, we can agree to the point of the AP market being questionable on a good day. North America has the highest level of regulation in this massive and growing global unregulated market.
To this, the term TRUE or ABSOLUTE HEPA had to be added to the naming convention (messaging and claim) by many of the industry leaders, most of which as described above have 99.97% filtration effectiveness and were concieved for use in operation theaters and pharmacies and later offered solutions to the consumer to handle home based needs.
The Term TRUE/ABSOLUTE HEPA exists only due to the crowded air purifier market which was both claiming HEPA but not meeting the industry standard as described above.
For a filter to be labeled "True" HEPA, it must be certified 99.97% efficient in capturing 0.3 micron (not 0.1 or 0.01 etc..) respirable-size-particles (RSP) according to the U.S. Military Standard MIL-STD-282, commonly known as the DOP test. The reason 0.3 micron is used and no other is because 0.3 micron is the size at which all mechanical filters are LEAST efficient in capturing. Other methods of testing do not give a true picture of efficiencies relative to respirable-size-particle (RSP) capture.
Look for companies who either provide this label on their AP's or can produce the certification to make sure they meet this industry standard!
Here is another good source to explain TRUE/ABSOLUTE HEPA that was recently posted.
True HEPA Air Purifiers
By Anthony J Davis
http://ezinearticles.com/?True-HEPA-Air-Purifiers&id=3520858You will probably see items that are labeled "True" HEPA if you shop for HEPA air purifiers. So, I'm sure you're wondering, does that mean there's a false one? Of course you would never find a product that boldly proclaimed to be a sub-standard HEPA purifier, but to be called a True HEPA purifier, there are some differences. As with any other purchase, it's left to the consumer to figure out the differences and know if they need to look for one or the other. Let's examine True HEPA air purifiers and why some products may not claim this.
How Are True HEPA Purifiers Different
There is a difference between a HEPA-type air purifier, and a True or absolute HEPA purifier, which is also called an absolute HEPA air purifier. Even if folks do not always make it clear, when they're comparing HEPA filters to other air filtration medium, especially if they're referencing the likes of OSHA or the EPA, they're talking about True or absolute HEPA filters. Yes, there are many types of air cleaners and purifiers available, but the only ones that places like labs and hospitals use are True HEPA air purifiers.
True HEPA Filters Stop 0.3 Micron Particles Of DOOM
Of the different specifications that True or absolute HEPA purifiers have to meet, the most important is probably the 99.97% of all 0.3 micron particles. This stat is incredibly important, and not as technical as it may sound. Of all the different pollutants floating around out there, it's been found that 0.3 micron particles generally are the hardest to filter, even including those that are smaller. They also are the most likely to cause problems in the human body, and have no problem scooting right past our natural defenses. See, 0.3 micron particles are more scary than nerdy, aren't they? If you want an idea of the size we're talking about, compare 0.3 microns to the human hair. Human hair is generally anywhere between 70 and 100 microns thick.
True HEPA Filters Actually Work Better When Dirty
Another big difference between HEPA-type purifiers and True HEPA filters is how they filter when they become dirty. This is where the "Absolute" part of the equation comes in. Any absolute filter media will actually become more effective as it gets dirtier. The more particles that are trapped in an absolute filter, the more effective it will be. The reason why is actually pretty simple. As dirt and other debris builds up around the air holes, those holes get smaller and smaller, allowing less to get through.
Is It A True HEPA Air Purifier? How To Know
Look for products that actually advertise that they are True or absolute HEPA air purifiers. The alternative is the HEPA-type purifier, which is really just an imitation, and is not held to any particular standard. If you find a purifier that doesn't say either HEPA-type or True HEPA, you can also reference other specifications on the box. Look for one that filters 99.97% or more of the 0.3 micron particles if you want a True HEPA air purifier.
Looking for more information on HEPA air purifiers? Check out HEPA Air Purifiers Info.
Article Source:
http://EzineArticles.com/?expert=Anthony_J_Davis
Added on January 13, 2010, 11:02 amQUOTE(saykong @ Jan 6 2010, 08:16 PM)
At first I quit trust this site
http://www.air-purifiers-america.com/lc_ho...linkid=leftMenubut after browse through it, I can't find how they test the air purifier
and when I go to check sharp air purifier
http://www.air-purifiers-america.com/categ...linkid=leftMenu some sharp air purifier
get particles remove for 99%(put mouse pointer to the model), so why
they didn't get in to top 10 ???
Hi Saykong,
If you have found airpurifiersamerica.com then you have found likely the top independant resource for Air Purification reviews today.
They are one of few which have both a test facility and industry aligned bench testing processes and methodology putting all brands and products to the real test first and foremost in support of both their filtration levels and claims.
I'm not sure why the SHARP models were not tested and will try and find out however the top 10 are in fact PREMIUM Air Purifier Brands and meet very high levels of Air Filtration Performance.
This post has been edited by Onemorething: Jan 13 2010, 11:02 AM