flue fan vfd speed cmd point
| cmd | 
 Point is a command, actuator, AO/BO 
 | 
| fan | 
 Fan equipment or control point 
 | 
| flue | 
 Duct for exhausting combustion 
 | 
| point | 
 Data point such as a sensor or actuator 
 | 
| speed | 
 Distance per unit time 
 | 
| vfd | 
 Variable-frequency drive 
 | 
| vfd-speed | 
 VFD speed measured in "%" 
 |