Adjustable Speeds---When the air is thick, for whatever reason, an effective cleaner should be able to deliver more fresh air, and do it faster. Having the option to increase or decrease the rate at which the air is filtered is also a money saver.
The whole point behind using a cleaner is to take back control. And being able to do that by turning a dial not only produces fresh air, but peace of mind.
Continuous Cleaning---Since the object of filtration is to keep allergen levels low all the time to decrease the number and severity of flare-ups. Having to turn a cleaner on and off is just one more thing to remember.
Having to stop filtration at regular intervals because the motor needs a break allows pollutants levels to rise. As a result, the cleaner has to play catch up, and the air is never really clean for long enough to make a noticeable difference in how you feel.
Fresh Air As The Only By-Product---There is still great controversy about the effects that ozone and ionized particles have on living things. Experts agree that fresh air is best. Choose a cleaner that produces only clean air its result.
HEPA Filtration---HEPA is an acronym for high efficiency particle arresting filtration. This technology is used by hospitals to provide clean air. To awarded this designation it must have proven to be able to remove 99.97% of airborne particles that are .3 microns or greater in size.
The ability to remove particles that are this small means it can take out well known allergy triggers such as all too normal household dust, dust mites, mold and mildew spores, pet dander, and airborne bacteria and viruses.
Multiple Filters---An effective cleaner needs more than one filter. One filter cannot do the job alone for as long as cleaner with more than one filter can.
It's true that cleaners with only one filter are usually less expensive. They are usually more work because they need constant maintenance. There are 2 things that are problematic about this. First, you have to use your time to take care of it, and secondly when it's being maintained, it's not cleaning the air. And that assumes the one filter can be maintained.
The not so good news is that if it cannot be maintained but must be replaced, there goes your spare time again, and now you need to spend money to buy the replacement.
Neither of these are good scenarios. The best type of purifier has multiple filters that are sized to eliminate a wide range of particles. This prevents any one filter from doing all the work. That means it will work to take care of you rather than the other way around.
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