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