However, this approach is cost-prohibitive with most air purifiers. They can often cover more square footage more evenly and more economically a single portable unit. Be particularly aware of air cleaners that use air filters . Air filters generally last about three months , and in many cases cost a couple hundred dollars to replace. Plus, these glass plates break very easily , and often need to be replaced.
Ceramic plates are much less susceptible to damage.
The UV bulbs also need to be replaced every 12-18 months. If your primary need for an air purifier is to eliminate or reduce an odor, then an air cleaner that uses ozone will be necessary . Air filters are not capable of removing most particles that cause odors, but ozone can destroy most odor-causing particles. Negative ion-only air purifiers are not very effective at removing odors either. They can help reduce odors to a degree, but are mostly effective at removing solid particles such as dust, pollens, animal dander, etc.