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Leaders have learned much about fire prevention techniques since then, he noted, such as building with nonflammable materials and clearing brush away from houses.

The daylong effort is hazardous because of the high pressure used to test the system with helium, a nonflammable gas.

Discovered in the 1920s by a chemist at General Motors, these compounds were odorless, nonflammable and seemingly nontoxic — all properties that made them useful to industry.

Anhydrous ammonia is a colorless nonflammable liquefied gas.

The fire of that era also destroyed most of the Near North Side of the city, meaning that anything new had to be built in stone or other nonflammable materials.