Question 636 Deck Safety

The correct answer is C) convection. Ventilation systems connected to a compartment with a fire are normally closed to prevent the rapid spread of the fire by convection. Convection is the transfer of heat through the movement of a fluid, such as air. By closing the ventilation system, the flow of hot air and gases from the fire is restricted, which helps to contain the fire and prevent it from spreading quickly through the ventilation ducts. The other answer choices are incorrect because: A) Spontaneous combustion is not the primary mechanism by which fires spread through ventilation systems. B) Conduction, the transfer of heat through direct contact, is not the main way fires spread through ventilation. D) Radiation, the transfer of heat through electromagnetic waves, is not the primary mode of fire spread in this scenario.