When a sensor detects a significant change in air flow and air pressure, a detection signal is analyzed by {HEAD ~ a controller unit microprocessor} for comparisons with a preselected operating range for air flow and {TAIL ~ pressure} 
When a sensor detects a significant change in air flow and air pressure , a detection signal is analyzed by { HEAD ~ a controller unit microprocessor } for comparisons with a preselected operating range for air flow and { TAIL ~ pressure }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL