[Room] has Space Type set to Plenum but has no ceiling surface. A plenum must be separated from the space it serves by a ceiling.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)
Syntax
C#
public static FailureDefinitionId PlenumWithNoCeilingWarn { get; }