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