| ChimneyCd | A code describing the material used to construct the chimney. This element uses the Chimney code list. |
| ChimneyCleaning | This describes the chimney cleaning for the primary/supplemental heating unit. |
| Diameter | The diameter of the item. |
| FlueInfo | This aggregate contains information about heating sources that share a flue. |
| GroundUpChimneyInd | Indicates whether a masonry chimney is built from the ground up. |
| InstallationCd | A code indicating the installation type of the item. This element uses the Installation code list. |
| Length | The length of the item |
| LengthPipeHorizontalRun | The length of the horizontal run of the pipe. |
| LiningCd | A code indicating the lining of the item. This element uses the Lining code list. |
| PipeVentStyleCd | A code indicating the pipe vent style. This element uses the PipeVentStyle code list. |
| StovePipeCd | A code indicating the type of stove pipe. This element uses the StovePipe code list. |
| ThimbleInd | Indicates if a stove pipe passing through a combustible wall, ceiling, closet or concealed area passes through a thimble. '1' (True) indicates that the pipe does pass through a thimble, '0' (False) indicates that there is no thimble. |
| ThimbleInfo | This aggregate contains information related to a thimble. |
| UnitLocationCd | A code indicating whether the item is inside or outside the structure. This element uses the UnitLocation code list. |