A chair burning in an open container without a sprinkler system shows the dangers of not having a sprinkler. In an enclosed room poisonous gas and heat would rapidly build up. The climbing temperature could cause a flashover where every combustible surface exposed to the fire’s heat bursts into flame. (Steve Kuchera / skuchera@duluthnews.com)
A chair burning in an open container without a sprinkler system shows the dangers of not having a sprinkler. In an enclosed room poisonous gas and heat would rapidly build up. The climbing temperature could cause a flashover where every combustible surface exposed to the fire’s heat bursts into flame. (Steve Kuchera / skuchera@duluthnews.com)

Water from a sprinkler douses a burning chair during Friday’s demonstration. “Because of the sprinkler we only burned about half of the chair and saved the rest of the room,” Duluth firefighter and LSC instructor Heath Wiersman said. (Steve Kuchera / skuchera@duluthnews.com)
Water from a sprinkler douses a burning chair during Friday’s demonstration. “Because of the sprinkler we only burned about half of the chair and saved the rest of the room,” Duluth firefighter and LSC instructor Heath Wiersman said. (Steve Kuchera / skuchera@duluthnews.com)

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