Why Honeywell recommends 6 air changes per hour?
The degree to which air quality is improved is strongly influenced by the number of air changes per hour (ACH) achieved by the unit. Air is cleaned by constant circulation through the air cleaner, and the ACH is: volume of air to be treated in the room divided by the volume of air passing through the air filter. Therefore, in choosing the right system for your needs, the size of the room as well as the capacity of the air cleaner must be considered. The enviracaire series of True HEPA air cleaners provides a choice of units which will deliver the air-cleaner efficiency for your needs: 4 to 5 ACH Research has demonstrated that recirculating or changing the air in the room four to five times per hour with a high efficiency True HEPA filter will cut airborne contaminants in half (50 percent), resulting in good air quality improvement. This is the minimum recommended air circulation for allergy sufferers. 6 to 7 ACH Changing the air in the room six to seven times per hour will yield a 70 p
