Which component must be labeled for use with a specific factory-built chimney system?

For a factory-built chimney system, shrouds must be labeled for use with that specific system. A shroud serves as a cover or protective casing around the chimney or vent pipe, which can help select the proper model for the installation. Since shrouds are integral to the safety and operational integrity of the chimney, using components that are specifically labeled for compatibility ensures that they meet the manufacturer’s specifications and local code requirements. This reduces the risk of failure or hazardous conditions, as improper components could lead to performance issues or unsafe situations.

Other components, while also critical to the chimney system, do not necessitate the same level of specific labeling focused on the shroud. Each part of a chimney system plays a role, but the labeling of the shroud directly correlates with its responsible application and the assurance of safety standards.