What system is used to provide weather air inside the ship?

The system responsible for providing weather air inside a ship is primarily the ventilation system. This system is designed to ensure proper air circulation throughout the ship, managing the intake and exhaust of air, and helping maintain a comfortable atmosphere for crew and passengers. It also plays a crucial role in applications such as controlling humidity and removing stale air.

The supply system typically refers to any mechanism that delivers resources, but it is not specific to managing the environmental conditions within the ship. The air conditioning system is focused more on cooling and dehumidifying the air rather than simply providing outside air. Similarly, the heating system is dedicated to raising the temperature of the air rather than ensuring a steady flow of weather air from outside.

Understanding the distinction between these systems clarifies why the ventilation system is the correct choice, as it encompasses the key functions needed for air quality and circulation on board.