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The fire service was called after thick black smoke was seen billowing into the sky.
Crews arrived at in Castle Road, Maidstone just after 3pm, following reports that a large amount of smoke was coming from the Allington 20/20 Industrial Estate.
Eyewitnesses Lukhvinder Kooner spotted the plumes from Allington Community Centre.
He said: "At about 3pm, smoke could be seen rising over the trees. It appeared to be coming from the Allington 20/20 industrial Estate.
"I could hear lots of sirens from emergency vehicles in the Castle Road area. "
However, when a fire engine arrived at the scene, crews found it was just controlled burning, and the incident was closed at 3.15pm.