Indoor Air Quality Procedure: The Performance-Based Approach For example, the 2,400 cfm outdoor airflow calculated above cannot be reduced below 900 cfm. The most complex scenario is a multi-zone system with recirculation, where ASHRAE provides a detailed calculation procedure broken down by steps.ĭemand controlled ventilation (DCV) can adjust the outdoor airflow according to occupancy, but it cannot fall below the area-based airflow component. If the distribution effectiveness for the example above is 0.8, the zone outdoor airflow must be 3,000 cfm (2,400 cfm / 0.8).Ī single-zone ventilation system only requires one outdoor airflow calculation, and multi-zone designs without recirculation are based on a simple addition of individual airflows. It is then divided by the Zone Air Distribution Effectiveness, to obtain the Zone Outdoor Airflow that must be supplied by the ventilation system. ![]() This value is called the Breathing Zone Outdoor Airflow in ASHRAE Standard 62.1.
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