The emergency services were called to the fire just before half past ten on Monday evening. They are on site with eight units and are working to extinguish the fire both internally and externally.
It is a ventilation that has started to burn in an industrial premises outside Kopparberg.
The police and ambulance are also at the scene.
– Everything has been evacuated and no one should be injured at the moment, says Sören Gustavsson.
There is still no forecast for when the fire may be out.
The text is updated.