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Old 12-21-2018, 08:14 AM   #1
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Default Spray dust trigger fire alarm?

Hey all, I have done a decent amount of small spray jobs. I have a large commercial office ceiling. I will wrap the alarms just to be safe, but will the spray dust trigger fire alarms?
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Old 12-21-2018, 08:24 AM   #2
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It can. Make sure you cover them all. I set one off one time. There had been a water leak so I took out a rattle can of cover stain to prime it and there was a smoke detector 15 or 20 feet away so I did not cover it I mean it was a small stain. That was the wrong decision. Luckily it did not trigger the sprinkler system as they were working on that too at the time but it could have been a mess.

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Old 12-21-2018, 08:48 AM   #3
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yes it will. Smoke detectors actually measure a light source. Anything that significantly reduces the amount of light in the sensor (smoke for example) will trigger the alarm.
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Old 12-21-2018, 09:24 AM   #4
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I would think so. I've triggered them just from sanding drywall. It's always a treat when the fire dept. shows up........
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Old 12-21-2018, 10:25 AM   #5
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Yup. If it can shut down a gas water heater (which it did) then it can definitely affect an alarm.
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Old 12-21-2018, 11:57 AM   #6
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Yes. Cover them ALWAYS. Especially in a high rise building...

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Old 12-24-2018, 12:38 PM   #7
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Definitely can. Heat detectors won't go off but most smoke detectors and or beam sensors will via dust (drywall, aersol paint, concrete dust from cutting, etc). As stated most use a beam of light either internally or in the case of open beam sensors (shooting a beam across say a gymnasium or auditorium) externally.

Easiest way is buying a box of plastic sandwich bags and taping them over the heads.

Not to mention, even if they aren't set off, the droplets of paint you have made into an aresol via the sprayer can comprise their effectiveness later on which could put liability on to you.

All firealarm and other life safety devices should never be painted and treated with respect. Inconvenient yes. But these systems are installed for a good reason.
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Old 01-02-2019, 01:40 PM   #8
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absolutely if the device measures light. Overspray in the air looks just like smoke to the sensor. Have met the fire department several times over missing a single sprinkler head that wasn't visible. Sometimes they get buried in commercial buildings.

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