|  System  | 
 Enumerated type listing flags that can toggle on or off certain calculations related to MEP systems. 
 Namespace: Autodesk.Revit.DB.Mechanical
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)
 Syntax
 Syntax   Members
 Members  | Member name | Value | Description | 
|---|---|---|
| All | -1 | System calculation is on for everything (with every bit being 1) | 
| Flow | 1 | System calculation is only for flow | 
| None | 0 | System calculation is off | 
| Performance | 4 | This mode is reserved for limiting the system propagation and other performance-boosting options. Note that the system-related functionalities might be traded off for faster layout capability in large system when this mode is on. Be careful that this mode is NOT included in the "All" mode. | 
| Volume | 2 | This mode is obsoleted in Revit 2017. | 
 See Also
 See Also