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[Agonzalez]

Will the fog machine set off my fire alarm?

[Abel Moderator]

1. Generally, fog machines will trigger optical fire/smoke detectors.
2. These detectors work by looking for interference in a light beam within the detector.

http://shack.net/ZU9LDL

[Agonzalez]

Other detectors, such as ionization, infrared (IR), heat, UV and CO detectors, generally will not be triggered by fog machines.