What is the term for the opening in the rear hearth through which ash and debris pass?

The term for the opening in the rear hearth through which ash and debris pass is referred to as an ash dump. This is a specific feature designed to ease the maintenance of a fireplace or wood-burning stove by allowing the removal of ashes without having to dismantle the entire setup or make significant mess in the living area.

An ash dump typically leads to a container or an area outside the building where the ash can be deposited safely. It significantly enhances convenience for the user, as it eliminates the need for manual scooping and minimizes the risk of ash spillage.

Other terms listed, such as flue outlet, ventilation shaft, and debris chute, refer to different elements or functions within a chimney or ventilation system that do not specifically relate to the direct disposal of ash from the hearth. Understanding these definitions helps clarify the distinct purposes of various components involved in fireplace and chimney systems.