Workers at a plastics factory in New Hampshire restarted operations following a mechanical malfunction that forced an evacuation.
A “combustion system malfunction on an industrial oven” was behind the Monday incident at the plant, said a spokeswoman for Saint-Gobain Performance Plastics in Merrimack, NH.
No one suffered an injury in the incident.
Smoke was coming out from ductwork and Saint Gobain had used a dry chemical fire extinguisher to put out most of the fire, said officials at the Merrimack Fire Department.
The department determined an explosion and flash fire had happened in the exhaust ductwork, but did not spread to the building itself.
The cause of the malfunction is being investigated.