How many inches down from the ceiling must audible notification appliances be mounted?

Audible notification appliances must be mounted a minimum of 6 inches down from the ceiling to ensure that the sound generated is effectively distributed throughout the area while avoiding obstructions that could muffle the alarm. This height is established to help improve the audibility of alarms and ensure they can be heard by building occupants, especially in large or complex spaces.

Placing the appliances too close to the ceiling may lead to sound being trapped or reflected off surfaces, reducing the effectiveness of the notification system. The specified height allows the sound waves to disperse more evenly across the area, ensuring occupants have adequate warning in an emergency situation.