Smoke, trigger a fire sprinkler. Most fire sprinkler heads occur Geared up having a glycerin-loaded glass bulb. As being the glycerin heats up due to the heat from a fire down below, it expands, shatters the glass bulb, and triggers the sprinkler head. The fire sprinkler change senses this circulation https://griffinsixly.timeblog.net/71097437/indicators-on-fire-alarm-systems-you-should-know