Tiffin firefighters responded to an air line rupture at American Fine Sinter, 957 Maule Road, early Sunday morning.
A Tiffin Fire Rescue Division spokesman said employees of the plant heard a hissing sound and evacuated the building, thinking it could have been nitrogen, hydrogen or natural gas.
Firefighters found an air line had ruptured on a piece of equipment and shut off the air line, he said.
No one was injured, the spokesman said.
320 Nelson Street , Tiffin, OH 44883 | 419-448-3200