When shopping for a HEPA air purifier, you'll often see products labeled as a "True" HEPA air purifier. This can be confusing because, if there's a true, then there must be a false, right? There are a few different things that True HEPA air purifiers are comparing to, but none of them will be labeled as false or sub-standard, of course. It's up to you, the consumer, to know the difference, and know if it affects you. Let's take a look at the True HEPA Air Purifier, and see what they are comparing to.
True HEPA Air Purifiers Are Different
There is a difference between a HEPA-type air purifier, and a True HEPA air 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 HEPA filters. Yes, there are many types of air purifiers available, but the only ones that places like labs and hospitals use are True HEPA air purifiers.
Do True HEPA Air Purifiers Stop Particles That Others Don't?
One of the main things that a true HEPA air purifier must be able to do is filter at least 97% of 0.3 micron particles. This may sound like so much technical jargon, but it's actually quite important. 0.3 micron particles are the hardest size for filters to stop, including those particles that are even smaller. Not only that, but they are small enough to very easily bypass the human body's natural defenses and enter the respiratory system, causing all sorts of maladies. Suddenly 0.3 micron particles sound a little less nerdy, and a bit more deadly. If you're interested in how small 0.3 microns actually is, compare it to a human hair. A human hair can be anywhere from 70 to 100 microns in thickness.
Best When Dirty! True HEPA Air Purifies Actually Work Better When Dirty
Another big difference between HEPA-type purifiers and True HEPA air purifiers 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 There A Way To Tell If A HEPA Air Purifier Is True?
Look for products that actually advertise that they are True HEPA air purifiers. The alternative is the HEPA-type air 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 97% or more of the 0.3 micron particles if you want a True HEPA air purifier.
Still not sure that a HEPA air purifier is for you? Visit HEPA Air Purifiers Info for answers to all of your questions.
categories: air,appliances,allergies,asthma,pollution,health,electronics,science,filter,guide,shopping,gadgets,product review,green
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