Fire crews could see the thick black smoke that was billowing into the air as they rushed to the blaze off Spains Lane in Kingswood on Tuesday afternoon.

The fire erupted in the machinery shed shortly after 2pm, taking hold of the tin structure.

After the first triple zero call, Fire and Rescue NSW deployed four crews to the fire from Tamworth and West Tamworth to back up local Rural Fire Service (RFS) units.

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Firefighters had to battle LPG cylinders inside as they worked to douse the flames, and stop the fire from spreading.

There was little they could do to save the contents, with the fire ripping through machinery inside.

Police and paramedics were also called to the scene after fire crews had initial fears for one person who was missing at the time of the call out. Luckily, no one was injured.

RFS volunteers spent much of the afternoon mopping up the blaze and demolishing the charred remains for safety reasons.

The cause of the fire is being investigated.

Meanwhile, a bush fire east of Narrabri is expected to burn for a number of weeks due to steep terrain.

The RFS said many North West residents may notice more smoke as the Kaputar fire continues to spread in all directions under variable winds.

By late-Tuesday, close to 7800 hectares had already been burnt in the Kaputar National Park.

It comes a day after smoke blanketed much of Tamworth. Winds have carried the smoke from blazes burning at Dungowan and another at Watson's Creek.

- with Madeline Link and Jessica Worboys

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