What is the minimum adjustment for sensitivity in smoke detectors?

The sensitivity adjustment for smoke detectors is crucial for ensuring that they operate effectively without causing false alarms. According to NFPA 72, which provides guidelines for fire alarm systems, smoke detectors must have a minimum sensitivity setting to detect smoke accurately while minimizing the chance of nuisance alarms.

The correct answer, which is a sensitivity adjustment of 0.6%, aligns with the recommended standards for photoelectric and ionization smoke detectors. This level of sensitivity ensures that smoke detectors are adequately responsive to smoke particles that indicate a fire while also balancing the risk of false alarms that can occur from normal household activities, such as cooking or steam.

Each of the other sensitivity options provided does not meet the standard requirements established to enhance both safety and performance. Adjusting smoke detector sensitivity below this threshold might lead to inadequate smoke detection, increasing the risk of undetected fires.