What is the minimum horizontal distance smoke alarms should be installed from the tip of a ceiling suspended fan?

The minimum horizontal distance that smoke alarms should be installed from the tip of a ceiling-suspended fan is 914 mm (36 inches). This guideline is crucial because the airflow generated by the fan can interfere with the smoke detection process. Smoke alarms rely on the ability to detect smoke particles in the air, and if they are too close to a fan, the air movement can dilute or prevent smoke from reaching the alarm promptly. By positioning the smoke alarm at least 36 inches away, it helps ensure that the smoke detection is not compromised, allowing it to function effectively in the event of a fire.

In contrast, other distances provided in the options may not sufficiently consider the effects of airflow from the fan. Distances like 1200 mm (48 inches), 1524 mm (60 inches), or even 300 mm (12 inches) may not align with the standard practices that ensure reliable performance of the smoke alarm under typical conditions involving ceiling fans. Therefore, adhering to the 36-inch requirement creates a safer environment.