adjusting the flow of air through at least another airflow control device based on the concentration of {HEAD ~ carbon dioxide} flowing through {TAIL ~ the at least one airflow control device} 
adjusting the flow of air through at least another airflow control device based on the concentration of { HEAD ~ carbon dioxide } flowing through { TAIL ~ the at least one airflow control device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL