Kyle Forsythe, left, and Robby Hartpence, both field technicians for TREKK Design Group LLC, Kansas City, Mo., participate in a city sewer system test demonstration using smoke on Sept. 3, 2013. The test involved filling the sewer system, which may cause smoke to come out of manhole covers or even the roof vents of peoples' homes. That may cause people to mistakenly think their house is on fire.

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