Behind the scenes of Chicago Fire

By Joe Bennett

February 12, 2013 Updated Feb 13, 2013 at 7:54 AM CDT

CHICAGO, Ill. -- Just how realistic is the NBC drama portraying the lives of Chicago firefighters?

Pretty realistic, according to cast and crew of Chicago Fire.

News 25 was allowed on set in the Windy City where we discovered that actual firefighters sit in as extras on the show. Occasionally the fire fighters will even offer some advice.

Actors from the hit series say they saw first-hand how first responders switch to rescue mode when a call comes through.

"They do it for complete and utter strangers in every type of neighborhood, and they engage," says David Eigenberg, who plays Christopher Hermann. "They go. If they hear there is someone in the building and there is any humanly possible way to get in there, they go."

But do the fire fighters who watch Chicago Fire see the show as realistic, or do they see passed the smoke and mirrors?

Find out Wednesday on Nightside in our first of a two part series behind the scenes of NBC's Chicago Fire.

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