1. Introduction | 2. What’s New in the New Edition? | 3. Inside the Box | 4. Certificate of Performance
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



12. Performance and Air Exchange Rates

No matter how powerful or effective an air purifier is, you still need to be able to adequately circulate the room air through the filters to achieve any level of noticeable and effective air cleaning. The fan speed you select will determine how often the air inside your room is cleaned, and the size of the room will of course play an integral part in this calculation.

How do you determine the necessary rate of air exchange for your room?

This will vary based on a number of factors, including:

  • Intensity of air pollution source: The faster the rate of air pollution contaminants are entering your air, the faster you will need to circulate air through the unit to keep the air clean.
  • Filtration efficiency for specific air pollutants: The lower the efficiency of the filters to be able to filter out your air pollutants, the more air changes you will need to keep up.
  • Desired air quality improvement: The greater improvement in air quality desired, the more air changes you will need. 

For general air cleaning, you want to circulate the room air at least twice every hour (2 air changes). But if you have higher than normal air pollution, or if you want a higher quality air cleaning, you will want to increase the air exchange per hour. For allergies, asthma, and overall better quality air cleaning, we recommend at least 4 air changes per hour for best results.

There is a handy formula that you can use to determine how many air changes per hour each fan speed of the HealthPro Plus will achieve in your room. The number of air changes per hour is equal to:

Hourly air delivery of the system (cfm x 60)
Air volume of the room (cu. ft) (L x W x H)


So, for example, if you have a room with dimensions of 13' L x 14' W x 8' ft ceilings, it has a total air volume of 1,456 cu. ft. On the top speed 6 at 300 cfm, the air in the room will be circulated over 12 times per hour (300 cfm x 60 min = 18,000 cu ft/hr; 18,000 cu ft/hr / 1,456 cu ft = 12.36 Air Changes per Hour. On speed 3 (130 cfm), you would achieve over 5 Air Changes per Hour.


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