Do fire alarm horns have to be synchronized?

Since 1996, NFPA 72 has required the use of the temporal 3 pattern for the audible fire alarm signal. NFPA 72 Chapter 18.4.2.3 requires the standard temporal 3 evacuation signal to be synchronized within a notification zone. As an example, a zone would be the devices in an apartment corridor. Each apartment would also be [Read More]