Actor Taylor Kinney has said "If you (say) 'We're working on "Chicago Fire,"' they ask you if you're a soccer player".The building used in the show for the firehouse exteriors is a working Chicago Fire Department firehouse, and is the headquarters of Engine 18, located at 1360 South Blue Island Avenue at Maxwell Street, between 13th & Racine.
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He leaves in the season 3 episode "You Know Where To Find Me".
Alongside the firefighters are paramedics Gabriela Dawson and Leslie Shay. Some new faces appear in the firehouse as the series progresses.
Emanuel stated: "It's easier being mayor than playing mayor.
I told them I'd do it under one condition: the TV show is making an investment to the Firefighters' Widows and Orphans Fund." The title "Chicago Fire" has sparked some confusion in the show's first season in regards to it being shared with a local major professional soccer team; the Chicago Fire Soccer Club.
In November 2012, WGN-TV reported a plane crash at 29th and Martin Luther King Drive on their morning newscast and showed live footage for a few minutes before realizing it was merely a set piece pre-staged for Chicago Fire and not an actual emergency situation.
On March 27, 2013, NBC announced plans for a proposed spin-off of Chicago Fire, the police procedural drama Chicago P. that would involve the Chicago Police Department, the spin-off series being created and produced by Dick Wolf, with Derek Haas, Michael Brandt, and Matt Olmstead serving as executive producers. The show follows an Intelligence Unit of the police and is filmed entirely in Chicago.
Under the leadership of 25th Battalion Chief Wallace Boden, the firehouse family faces life or death decisions every day, but they treat each other like family, looking out for each other no matter what happens.
Mayor of Chicago Rahm Emanuel made an appearance in the series' pilot episode.
On May 9, 2018, NBC renewed the series for a seventh season.