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A video of me testing an Edwards fire Alarm System for a customers. This system is located in a vacant residential apartment building. 4 stories high, its a simple conventional system. I love the horns they have since the low pitch noise just plows through the walls. The electromechanical "vibration" horns were the ones to use.. Now days, the horns are loud but they do not carry through a building like the old ones did so now you have to have more of them...... I wish the NAC's would do march time...