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How long will it take before the fire alarm goes off? Why is there a delay? Watch this video all the way through and find out how long this one took. The delay is in case of false alarms. The fire alarm is activated by changes in pressure of the fire sprinkler system. The pressure changes all the time due to all kinds of factors. That is why within these systems there is what’s called a flow switch. What is a Flow Switch? A water flow detector, also known as a flow switch, is an electro-mechanic
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