Locals in Chirk say there has been a response from all the emergency services at the Kronospan factory.
A spokesman for Kronospan thanked the emergency services for their response to the "non-work related medical emergency".
"There was a medical incident at the Kronospan site at Chirk this morning which required a response from the emergency services.
"This was a non-work related medical emergency that involved one of our own employees and it was attended by the air ambulance and road ambulance crews.
"Due to the personal nature of the incident, we will not be making any further statement with regards to the individual involved.
"We would like to thank the emergency services for their quick response in attending site and transferring the affected employee to hospital.
"Our wishes are with the individual involved and their family at this time."
A spokesman for North Wales Police said: "It is a medical incident. Police are there to assist with the landing of the air ambulance."
Councillor Brian Colley, chairman of Chirk Town Council said: "It seems to be a major incident, with the air ambulance there.
"I hope that people are OK but I do not know what has happened."
A spokesman for North Wales Fire & Rescue Service said: "One crew did attend a factory on Holyhead Road, Chirk at 10.15am to assist the ambulance service but no fire service action was required."
The Wales Ambulance Service has been asked to comment.