What is the minimum mounting height (to the top of the device) for an audible notification appliance?

• A. 66 inches
• B. 72 inches
• C. 90 inches
• D. 96 inches

Answer: (C)

The main idea is that audible signaling devices must be mounted high enough so their sound can travel across the room without being blocked by people or furniture. NFPA 72 sets a minimum height for the top of an audible notification appliance to ensure proper audibility in typical spaces. The height of 7 feet 6 inches (90 inches) places the device well above average head height and obstacles, helping the sound project clearly to occupants.

66 inches and 72 inches are too low to guarantee reliable audibility in larger rooms or spaces with furniture. Mounting at 96 inches is allowed, but it’s higher than what’s required. Since the question asks for the minimum height, 90 inches is the correct choice.