Here is a link to a news story of a fire that broke out in a garbage chute and before the fire department arrived at the scene, it was the built in sprinkler system that put out the fire.

http://www.thespec.com/news-story/5533101-garbage-chute-fire-puts-tenants-out-of-building/

This is another example of how important it is to have a sprinkler system in you trash and laundry chute.

Fire Sprinkler for your chute system

Fire Sprinkler for Chute Intake