Although the news reports are focused on the recent loss of a historic school in Champlain, New York, a fire door between the original section and a 1960’s addition did help to prevent the spread of smoke and flames:
Here’s another news report about the fire:
And an article that mentions the fire door:
Investigators Work On Cause of Fire – Press Republican
There was only minimal damage to the addition in the back of the school.
“They had fire door, which did stop the fire.”
There was a fire in the school not long after it was built in the 1920s, the chief said.
An addition was built on the back of the building in the 1960s and part of the school burned in another fire in 1985, he said.
If anyone finds a photo showing both sections of the building after the fire, send me a link!