Additional crews were called to a fire Monday night at a mattress factory in the Canaryville neighborhood on the South Side. Firefighters responded shortly after 8:30 p.m. to the fire at the mattress at 4041 Emerald Ave., according to the Chicago Fire Department. Crews were battling the fire from the outside of the building, eventually putting it out by 10:49 p.m. The block-long building was a “large warehouse” with a heavy fire load as mattresses caught on fire, the fire department said. It had a sprinkler system which helped put out the fire as a fire engine fed it with water. The building remained structurally sound with only damage to the mattresses on the inside, fire officials said. No injuries were reported.