About three dozen employees at Sunny Corner Enterprises Inc. in Miramichi were taken to hospital Wednesday after some reported headaches and feeling nauseous.
A company official say all of the employees were later released and have fully recovered.
Terry Nowlan says he suspects a propane heater running low on fuel could have spewed the colourless, odourless fumes into the plant.
Fidel Cormier of WorkSafeNB says officials with the Crown corporation had been dispatched to the site.
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