It didn't take long to get a small fire out at a factory in Winchester.
The fire happened at Martek, a bio-diesel plant that makes food supplements.
Winchester Fire Chief, Daniel Castle, says employees at Martek were changing out air filters on the roof and when the filters went from one temperature to another.
It caused the filters to combust and caused a small fire.
The small fire was contained to the roof.
There were no injuries or major damage.