A new type of audible notification signal was introduced in the 2012 version of NFPA 72 that employs a low-frequency sound — in the 520 Hz range — when appliances are installed where people sleep. If ...
Q: There are a lot of different types of notification appliances for residential fire alarm systems. How do I know if I am using the right audible appliance for the panel I am installing? A: Fire ...
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