What name is given to the pipe that connects a fuel appliance to a chimney?

The pipe that connects a fuel appliance to a chimney is referred to as a chimney connector. This terminology is specifically used to describe the section of pipe that facilitates the safe passage of flue gases from the appliance directly into the chimney. The chimney connector serves several important functions: it ensures efficient venting of exhaust gases, maintains proper draft for combustion, and prevents the backflow of exhaust into the living space.

Chimney connectors are designed to withstand high temperatures and are typically made of metal, providing durability and safety in the venting system. Proper installation and sizing of the chimney connector are crucial to adhere to mechanical codes and to ensure the safe operation of the appliance.

In contrast, vent pipes are generally used for venting purposes, connecting appliances to a vent system that could lead outdoors without necessarily going to a chimney. Flue pipes refer to the passage within a chimney itself, and exhaust ducts are more often associated with HVAC systems that handle air rather than directly connecting appliances to chimneys. Therefore, referring to the connecting pipe specifically as a chimney connector is the most accurate term in the context of code compliance and safe installation practices.