proto
ventilation air pressure sp point
implements
| air | 
 The mixture of gases which surrounds the earth  | 
|---|---|
| point | 
 Data point such as a sensor or actuator  | 
| pressure | 
 Measure of force applied  | 
| sp | 
 Point is a setpoint, soft point, internal control variable, schedule  | 
| ventilation | 
 Duct to access fresh outside air only for ventilation, not economizing  |