The fire broke out before 9:00 p.m. on Wednesday. Soot caught fire in the chimney of a house on Widok Street, on the way out of Bolesławiec.
Three fire service units, including a ladder truck, are at the scene.
Six people were evacuated; no one was injured. There was a low concentration of carbon monoxide (5 ppm) in one of the rooms.
The firefighters are emptying the cleanout of the central heating furnace and cleaning the chimney flue.
