| In the past, home air purifiers would boast of | | | | purifiers with this technology offer. |
| health benefits and dust reduction features, | | | | CADR is usually certified by the Association of |
| leading to cleaner homes with healthier inhabitants. | | | | Home Appliance Manufacturers (AHAM), and |
| But what they did not realize was that their air | | | | refers to the number of square feet that can be |
| purifiers were too weak to circulate filtered air | | | | changed by the air purifier in an eight foot tall |
| throughout an entire room. No matter what kind | | | | room. There's a different number for smoke, dust |
| of filters there were and how many of them | | | | and pollen for each air purifier. The rule of thumb |
| were used, the result was that the same air was | | | | is to get a purifier at with a number at least |
| being filtered over and over again in one corner of | | | | two-thirds of the size of the room it will stay in. |
| the room while the rest of the air in the house | | | | For example, for a 10-square-foot room, the |
| remained unaffected. | | | | CADR should be at least 66 each for smoke, |
| Today, however, air purifiers are being equipped | | | | dust, air and pollen. |
| with air circulation technology inspired by jet | | | | The number of air changes is also measured |
| engines. Now, along with energy consumption, | | | | depending on the size of the room. Six air |
| filter type, reliability and style, one also has to | | | | changes per hour is more than adequate for |
| consider CADRs, or clean air delivery rates, and | | | | regular use. Again, the size of the room comes in |
| the number of air changes per hour. However, | | | | square feet, and the measuring body assumes |
| this should be a welcome development when | | | | that the room's ceiling is eight feet high. |
| compared to the benefits than new home air | | | | |