Fire crews were called to the Porte Marsh Industrial Estate in Calne yesterday lunchtime after receiving reports of a small fire.
Appliances from Chippenham, Melksham and Devizes were called to the scene, where a fire had broken out in an outside extraction system.
The fire was extinguished by crew using six breathing apparatus and two hose reel jets.
A spokesman for the Wiltshire Fire and Rescue Service said: "Crews were called to quite a small fire yesterday, the cause of which was accidental."
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