According to NFPA 72, what is the maximum sound pressure level permitted in a space with notification appliances?

NFPA 72, the National Fire Alarm and Signaling Code, outlines the requirements for fire alarm systems, including the standards for notification appliances. The specified maximum sound pressure level in areas where these appliances are installed is critical for ensuring that alarms are both audible and effective for alerting occupants.

The maximum sound pressure level of 110 dBA is set to ensure that alarms are loud enough to be heard clearly, even in noisy environments. This level is suitable for ensuring that individuals can hear the alarm over background noise, which is especially important in places such as industrial or commercial settings.

By setting this level at 110 dBA, the code acknowledges the need for a high enough intensity to overcome various ambient sounds, thus ensuring occupant safety during emergencies. Lower sound levels could lead to alarms being overlooked or not heard at all, potentially putting lives at risk.