| English | Russian |
| flue gas stack | дымовая труба (Industrial chimneys are commonly referred to as flue gas stacks and are typically external structures, as opposed to being built into the wall of a building. They are generally located adjacent to a steam-generating boiler or industrial furnace and the gases are carried to it with ductwork. wiki Alexander Demidov) |
| flue stack economizer | экономайзер (печных газов Millie) |