Ductwork (noun)

1. The system of pipes and ducts used to circulate air in a building or vehicle.
2. The pipes and ducts that make up the ventilation or air conditioning system in a building or vehicle.

Origin:

The word "ductwork" is a compound noun that is made up of "duct" meaning "a tube or pipe for conveying fluid or air" and "work" meaning "a system or mechanism for accomplishing a task".

Examples:

1. The ductwork needs to be cleaned to improve the air quality.
2. The ductwork in the old building was in bad condition.
3. The new HVAC system includes upgraded ductwork.
4. The ductwork was poorly designed, causing inefficiency in heating and cooling.
5. The technician found a blockage in the ductwork that was causing the problem.