- A pipe or duct utilized, particularly in old times, to convey hot air or steam for heating functions.
- A pipe or duct familiar with express heat or steam.
- A pipe or duct familiar with convey hot-air or vapor from a furnace into apartments of a residence.
- A pipe or duct utilized, especially in ancient times, to share heat or vapor for heating purposes.
- A pipe or duct regularly express heat or steam.
- A pipe or duct accustomed communicate heat or steam from a furnace towards apartments of a property.