What is one characteristic of a vessel's intake duct in a ventilation system?

A vessel's intake duct in a ventilation system is designed to scoop air from outside the vessel. This characteristic is crucial for ensuring that fresh air is brought into the enclosed spaces, which helps to maintain safe and breathable conditions on board. Proper intake is essential not only for crew comfort but also for preventing the buildup of harmful gases or vapors from fuel and equipment.

When air is drawn from outside, it provides the necessary ventilation to dilute any potential contaminants that may accumulate within the vessel. This is particularly important in areas such as engine compartments or living quarters, where air quality can significantly impact health and safety.

While factors like the size of the duct and the presence of mechanical fans can play a role in the overall effectiveness of the ventilation system, the fundamental role of the intake duct is to continuously supply fresh air from the external environment. This vital characteristic ensures proper air exchange, which is necessary for combustion systems and for maintaining a safe atmosphere inside the vessel.