Which of the following is NOT part of a factory-built chimney construction?

The correct answer indicates that a single wall connector is not part of a factory-built chimney construction. Factory-built chimneys are designed with specific materials and configurations to ensure safety, efficiency, and compliance with building codes.

A factory-built system typically consists of either double or triple wall construction to provide insulation and maintain the necessary temperature within the chimney. Double wall constructions often feature an inner and outer wall, with an air gap that helps to insulate the chimney from the surrounding environment. Triple wall constructions add an additional layer for increased insulation and protection.

In contrast, a single wall connector is usually a simpler component that may not provide the necessary insulation and safety features needed for a factory-built chimney system. It is often used to connect a stove or appliance to a chimney but is not itself part of the factory-built chimney design, which relies on more robust and insulated construction methods for effective operation and safety. Air insulated systems also align with the factory-built guidelines, offering safe operation by utilizing the air between the walls for insulation.

Therefore, understanding these distinctions clarifies why a single wall connector does not belong to the components of factory-built chimneys.