Ignite Your Future: Ace the NICET Level 1 Fire Alarm Systems Exam 2025!

To determine the minimum number of smoke detectors required in a room measuring 40 feet by 15 feet, we can refer to relevant National Fire Protection Association (NFPA) guidelines, which often recommend a maximum spacing between smoke detectors. According to these guidelines, smoke detectors should be installed within specific distances from the walls and each other to ensure adequate coverage.

In general, a standard guideline states that smoke detectors should be placed no more than 30 feet apart in areas with smooth ceilings. Given that the room in question is 40 feet long, one smoke detector placed at one end would have a coverage radius of 30 feet, but this would not adequately cover the entire room since the other end would be left without detection.

By placing a second smoke detector strategically within the room, it can provide comprehensive coverage. Given that the room is narrow (15 feet), placing the two detectors in such a way ensures that all areas will be adequately monitored for smoke.

This is why two smoke detectors are determined to be the minimum requirement for this room size, ensuring early detection throughout the entire space.