The walls or partitions forming trunks above the engine and boiler spaces, providing air and ventilation and enclosing the uptakes. They extend somewhat above the weather deck, or superstructure deck if fitted, and are of sufficient size to permit installation and removal of engines and boilers. Doors are fitted at the several deck levels to permit access to the gratings and ladders.
Iindonga okanye iipatishini ezenza iitranki ngaphezu kwenjini nezithuba ze'boiler', zibonelela ngomoya neventileyishini, zikwavalela ukungena nokusebenza.