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