Should campuses run HVAC systems at 100% outside air to increase ventilation?

Many of our Corvallis campus buildings, including most laboratory spaces, operate using 100% outside air systems (makeup air systems). However, buildings served by mixed air systems have not been designed to run at 100% outdoor air. Doing so could damage building HVAC systems and create unintended indoor air quality issues.

For recirculating air systems, Oregon State University is implementing strategies that increase outside air delivery. In general, most if not all mechanically ventilated buildings on campus supply fresh air at rates that exceed industry best practice (ASHRAE 62.1). These ventilation rates are based on typical occupancy patterns.

Last Modified: 
April 23, 2021