What is the name of the area in the design of the retort that connects the main incinerating chamber to the stack or chimney?

The area in the design of the retort that connects the main incinerating chamber to the stack or chimney is referred to as the breech. This connection plays a critical role in the ventilation system of the cremation process, allowing for the proper exhaust of gases produced during incineration. The breech serves as a passageway that facilitates the flow of smoke and gases from the incinerating chamber to the stack, where these byproducts are safely directed away from the retort.

Understanding the function of the breech is essential for ensuring efficient operation and compliance with environmental regulations. It is designed to maintain necessary airflow and to prevent any back pressure that could compromise the cremation process and the efficiency of the system. In contrast, other terms like flue, chamber, and stack refer to different components of the system or aspects of ventilation but do not specifically denote this connecting section in the context of a retort.