As air passes through the filter, air purifiers usually consist of a filter, or several filters, and a fan that draws in and circulates the air.
Contaminantsand particles are captured, and clean air is expelled into the living space. Filters are typically made of paper, fiber (often fiberglass), or mesh, and require regular replacement to maintain efficiency. An air cleaner can't work efficiently if it has a dirty filter.
In general, you should replace filters (or clean those that can be vacuumed) every six to 12 months for pleated filters and every three months for activated carbon filters. The Air Purifier 6 performed very well, as you would expect from a machine with a Clean Air Supply Rate (CADR) of 325 cubic feet per minute. This means that in addition to the purchase price of an air purifier, you should also consider operating costs and filter replacement costs. But to qualify as excellent, an air purifier needs to be powerful enough to clean the air in a large living room or playroom, quiet and dark enough that you can sleep close to it in a bedroom, and economical enough to make it reasonable to have several spread out over the whole house.
When used correctly, air and HVAC filters can help reduce airborne contaminants, including viruses, in a small building or space. Many manufacturers use the Clean Air Supply Rate (CADR) rating system to evaluate air filter performance. An air purifier can act as a supplement to a filter and other strategies to help remove particles such as dust mites, pollen, pet dander, mold spores, smoke particles, bacteria, and viruses. You can also look for air purifiers and filters that are certified asthma and allergy friendly devices from the Asthma and Allergy Foundation of America. Using air filters alone cannot guarantee adequate air quality, especially when there are significant sources of pollutants and insufficient ventilation.
We have published a separate guide for air quality monitors, which we have found are often the best way to better understand the effects of a purifier on air quality, even though they are separate devices that do not directly control the operation of the purifier. Instead, in HEPA purifiers, a fan draws airborne particles through a dense felt-like filter that has billions of small voids of different sizes. The EPA does not recommend the routine use of DIY air purifiers as a permanent alternative to products of known performance (such as commercially available portable air purifiers). In fact, our years of testing have shown that any properly sized purifier will distribute filtered air evenly in the farthest corner of a room. Using ACH to categorize air purifiers overcomes a common problem in the way manufacturers rate their air purifiers in their advertising. So when is the best time to use an air purifier? The answer depends on your individual needs.
If you suffer from allergies or asthma, an air purifier can help reduce your symptoms by removing allergens from the air. If you live in an area with high levels of pollution or smoke, an air purifier can help reduce your exposure to these pollutants. And if you're looking for improved indoor air quality overall, an air purifier can help reduce odors and other airborne contaminants. When shopping for an air purifier, it's important to consider factors such as size and noise level. You'll also want to look for models with high CADR ratings and replaceable filters that are easy to access and change.
Finally, make sure you read reviews from other customers before making your purchase.