What is the maximum spacing allowed for smoke detectors, according to NFPA 72?

The maximum spacing allowed for smoke detectors according to NFPA 72 is 30 feet. This standard is set to ensure that smoke detectors can adequately detect smoke from a fire in a timely manner. The reasoning behind this distance is based on fire science principles, which indicate that smoke rises and spreads laterally in the early stages of a fire.

By positioning smoke detectors no more than 30 feet apart, the code aims to minimize the response time for detection. This spacing helps to ensure that detectors are placed close enough together to catch the smoke as it begins to accumulate, without leaving large gaps that could allow areas to go undetected.

Understanding this standard is crucial for ensuring safety in buildings, as well as compliance with fire codes. In practical applications, detectors should also be installed on ceilings or high on walls since smoke rises. While other distances are listed in the choices, they exceed the maximum allowed spacing outlined in NFPA 72, which is why they do not conform to established safety protocols.