What is the duct between a boiler and the stack?

What is the duct between a boiler and the stack?

• A. Breeching
• B. Duct
• C. Flue
• D. Chimney

Answer: (A)

The main idea here is the terminology used for boiler exhaust piping. The term breeching refers to the short metal duct that connects the boiler’s flue to the stack, carrying the hot flue gases from the boiler to be vented outside. It’s the specific connector between the boiler and the stack, which is why this term fits best. The other terms aren’t as precise for this role: the flue can refer to the entire passage that carries combustion products, not just the connecting duct, and the chimney (or stack) is the external vertical structure that vents gases to the atmosphere, not the connector itself.

The main idea here is the terminology used for boiler exhaust piping. The term breeching refers to the short metal duct that connects the boiler’s flue to the stack, carrying the hot flue gases from the boiler to be vented outside. It’s the specific connector between the boiler and the stack, which is why this term fits best.

The other terms aren’t as precise for this role: the flue can refer to the entire passage that carries combustion products, not just the connecting duct, and the chimney (or stack) is the external vertical structure that vents gases to the atmosphere, not the connector itself.