Question: Provide another name for a structure that provides ventilation for hot flue gases, or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere, used in relation to boats rather than buildings, an example being the paddlewheel steamboat known as the Lexington which sank due to an onboard fire when the structure caught fire igniting 150 bales of cotton?
Sentence (from "Lexington (steamship)"): The ships' overcrowded lifeboats were sunk almost immediately after their launch, leaving almost all of the ship's passengers and crew to drown in the freezing water, with rescue attempts impossible due to the rough water and lack of visibility.
Relevant evidence: No