Which of the following is NOT a common type of fire service equipment?

Fire doors are designed to prevent the spread of fire and provide safe escape routes, but they are not classified as standard fire service equipment that firefighters actively use to combat or manage fires. In contrast, hoses, nozzles, and personal protective equipment (PPE) are integral components of a firefighter's toolkit. Hoses are crucial for delivering water or other extinguishing agents to the fire, nozzles control the direction and flow of water, and PPE protects firefighters from heat, flames, and hazardous materials. While fire doors play a vital role in fire safety within buildings, their function is more about building safety and less about the direct engagement in firefighting operations. This distinction makes fire doors less relevant as a type of equipment that firefighters would typically utilize on the scene of a fire event.