proto

ventilation fan vfd freq sensor point

implements

fan

Fan equipment or control point

freq

Occurrences per unit time

point

Data point such as a sensor or actuator

sensor

Point is a sensor, input, AI/BI

ventilation

Duct to access fresh outside air only for ventilation, not economizing

vfd

Variable-frequency drive

vfd-freq

VFD frequency measured in "Hz"