What is the minimum mounting height for an audible notification appliance?

The minimum mounting height for an audible notification appliance is specified to ensure that the sound is effectively projected and heard throughout the area it is intended to alert. Mounting an audible notification appliance at 90 inches above the finished floor is in compliance with the applicable codes and standards, which aim to optimize both the visibility and audibility of the device in various environments.

Mounting at this specified height helps ensure that the sound from the appliance can effectively reach occupants, particularly those who may be hard of hearing, while also minimizing interference from other environmental factors. This height is typically chosen because it places the appliance at a level that is accessible for maintenance but still high enough to be less likely obstructed by furniture or other structures in most spaces.

Other heights listed in the choices either exceed the usual guidelines or fall below, which could lead to ineffective notification scenarios in emergency situations. Therefore, the regulation culminates in the recommendation of 90 inches as the ideal balance for both safety and practicality.