Simplex Appliances lists on UL Website

Discussion of all things related to fire alarms, including alarm systems, fire alarm collections, sirens, sprinklers, fire drills, evacuations, actual fires, building architecture, other kinds of safety drills like tornado and earthquake drills and such, etc.
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simplex 2901-9833
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Sun Mar 20, 2011 9:53 am ... sequence=1

They mentioned a 4903-9219H, which is probably the high-output version of the 4903-9219 (like the U-HNH is the high output U-HN).
Fire Drills: 9/14/11
False Alarms:
Lockdown Drills:
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