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The audible alarm notification appliances shall provide a sound pressure level of 15 decibels (dBA) above the average ambient sound level or 5 dBA above the maximum sound level having a duration of not less than 60 seconds, whichever is greater, in every occupiable space within the building.

Related Code Sections Notification Appliances,
The greater of the expected average ambient sound pressure level or expected maximum sound pressure level having a duration of at least 60 seconds ...