Ambient noise level significantly affects the placement and selection of notification appliances in a manufacturing facility because the alarm signal must be clearly audible above the background noise to ensure effective evacuation. High ambient noise can mask or obscure the audible alarm signal, making it difficult for occupants to hear and understand the need to evacuate. Codes and standards, such as NFPA 72, specify minimum sound pressure levels for audible alarms based on the ambient noise level. Typically, the alarm signal must be at least 15 decibels (dB) above the average ambient....
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