TCFP Plans Examiner Practice Test

How is fire spread through a ventilation duct system generally controlled?

1. By using fire-resistant materials

2. By installing automatic fans

3. Through fire dampers

4. Through sprinklers located in the ducts

The correct answer is: Through fire dampers

Fire spread through a ventilation duct system is generally controlled through the installation of fire dampers. Fire dampers are devices installed within ductwork that automatically close upon sensing heat or smoke, effectively preventing the passage of flames and hot gases from one area to another. This mechanism is crucial in maintaining the integrity of fire-rated walls and compartments, thereby limiting the spread of fire to other parts of the building. Fire dampers can be classified into different types, such as combination dampers that also serve as smoke dampers, and they are an essential component of a building's fire protection strategy. By restricting the movement of fire through the duct system, they protect occupied spaces and allow for safer evacuation routes. Using fire-resistant materials alone does contribute to controlling fire spread, but it does not actively manage the situation once a fire has started. Installing automatic fans may help with improving airflow but does not prevent fire spread. Sprinklers located in ducts can offer some fire suppression but are generally not the primary method for controlling fire spread in ventilated systems. Thus, fire dampers are the most effective means of controlling fire within ventilation ducts.