Which of the following would NOT be considered a normal duty of an engine company?

Ventilation is typically associated with a truck or ladder company rather than an engine company. The primary responsibilities of an engine company focus on fire suppression and water supply management. Engine companies are trained to handle the deployment and operation of hoses to combat fires directly and ensure an adequate water supply is established for effective firefighting.

While engine companies may assist with rescue operations as needed, their core functions are more aligned with controlling the fire and managing the necessary resources for suppression. Ventilation involves creating openings in a structure to release heat, smoke, and gases, which is generally handled by specialized teams that focus specifically on those strategies to enhance fire conditions for both victims and responders. Therefore, ventilation does not fall under the typical duties of an engine company, making it the correct answer in distinguishing normal duties.