What component connects to the stack for venting combustion gases?

The correct choice encompasses all components connected to the stack for the purpose of venting combustion gases, recognizing that each plays a specific role in the overall exhaust system.

The stack is the vertical passage used for discharging combustion gases safely into the atmosphere, and it connects to various elements of the heating system. The breech serves as a passageway for gases to move from the furnace or boiler into the stack, effectively guiding the exhaust to the outside environment. The flue is a channel or duct that specifically directs these combustion gases from the appliances into the stack. Meanwhile, the chamber refers to the area where combustion occurs, contributing to the generation of those gases that need to be vented.

By selecting "all of the above," it acknowledges the interconnectedness of these components in ensuring safe venting. Each part plays a significant role in the efficiency and safety of a heating system, contributing to maintaining proper ventilation and preventing hazardous buildup of gases within enclosed spaces.