5. Ultrafine Particles | 6. How Does it Work? | 7. Key Features | 8. Specifications | 9. Housing Design
10. Controls and Operation | 11. Inside the Unit | 12. Performance | 13. Noise Level | 14. Comparisons
15. Conclusion - Pros and Cons
13. Fan Noise Level
All high performance air purifiers use fans to circulate room air through filters to clean the air. This is the only truly effective method of air filtration. Of course, in order to circulate air with a fan you will by design always have some amount of fan noise. The key question is: how much noise does the air purifier make, and is it an obtrusive, disturbing type of noise, or a soothing and calming white background noise? Air purifiers can vary greatly in this area. Our experience is that the IQAir HealthPro Plus is not only the quietest but more importantly also the nicest "sounding" high performance air purifier on the market.
Each fan speed has a rated decibel level which tells us objectively how much noise is being produced with each fan speed setting, however this data is not very useful to us as actual people using an air purifier. What we really are looking to know is, can I live my life comfortably with this air purifier in my room without it becoming a nuisance because of the fan noise it makes? Of course every person's sensitivity to noise is different, but we can't be happier with the noise level of this air purifier. When set to the lowest fan speed, we literally cannot even tell it's on most of the time! For the most part though, we run our HealthPro Plus on speed 2 or 3, which are very quiet speeds. It just runs in our office all day and we barely notice it at all. Every once in a while, we'll crank it up to 5 or 6 just to quickly clear all of the air in the office within minutes. We like doing this particularly after the floor has been vacuumed, just to clear out any kicked up particles left behind by the vacuum cleaner.
Just to give you an idea of the noise level with the HealthPro Plus – on speed 1, the decibel level is 35, which is equivalent to the sound of a whisper. It is literally whisper quiet on the low speed. Speeds 2 and 3, the most commonly used speeds, generate 46 and 54 decibels respectively, which is about how much noise a running refrigerator makes. As you can see, it is very easy to have the HealthPro Plus running in the background without any disturbance at all. Only when you get up to the higher speeds 4, 5, and 6 do you really notice the fan noise. And we'd just as soon save these higher speeds for the occasional quick cleaning or just program the unit to run on these higher speeds from time to time while we're away.
Due to the high performance cfm of this unit's fan, you can achieve a very effective air exchange rate on even the low speeds in most sized rooms, so it is not usually necessary to run the unit on the higher speeds very often. What we do here in our offices is set the auto timer to run the unit on speed 2 during the day while we are here, and it automatically turns off after hours. This can also work great in your home - if in your bedroom, just set the timer to turn the unit on whichever speed you prefer about an hour before you plan to go to bed, and let it run throughout the night, and have it turn off automatically in the morning. Or, reverse it by running the air purifier during the day and off at night. Either way, while you can run it 24/7 if you'd prefer, you can achieve great results often by having it run about 10 hours per day.
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