In the past, home air purifiers would boast of health benefits and dust reduction features, leading to cleaner homes with healthier inhabitants. But what they did not realize was that their air purifiers were too weak to circulate filtered air throughout an entire room. No matter what kind of filters there were and how many of them were used, the result was that the same air was being filtered over and over again in one corner of the room while the rest of the air in the house remained unaffected.
Today, however, air purifiers are being equipped with air circulation technology inspired by jet engines. Now, along with energy consumption, filter type, reliability and style, one also has to consider CADRs, or clean air delivery rates, and the number of air changes per hour. However, this should be a welcome development when compared to the benefits than new home air purifiers with this technology offer.
CADR is usually certified by the Association of Home Appliance Manufacturers (AHAM), and refers to the number of square feet that can be changed by the air purifier in an eight foot tall room. There's a different number for smoke, dust and pollen for each air purifier. The rule of thumb is to get a purifier at with a number at least two-thirds of the size of the room it will stay in. For example, for a 10-square-foot room, the CADR should be at least 66 each for smoke, dust, air and pollen.
The number of air changes is also measured depending on the size of the room. Six air changes per hour is more than adequate for regular use. Again, the size of the room comes in square feet, and the measuring body assumes that the room's ceiling is eight feet high.
Autor: Jack M Patterson
Vornado Air is a long-time developer and pioneering innovator in air circulation technology. Their website features technical specifications, product descriptions, testimonials and even video demonstrations of their various products and technologies. The products featured include air purifiers, humidifiers, fans, heaters, filters and accessories. For more information, visit http://www.vornado.com or call 1-800-234-0604.
Added: September 14, 2009
Source: http://ezinearticles.com/
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