But the 99,000-hectare Currowan beast has drawn Fire and Rescue strike teams to the bush.

Along with Forestry and National Parks, the agency has been crucial in assisting Rural Fire Service in the response to the South Coast monster.

In early December, Fire and Rescue crews were assisting at Braidwood.

"When the Currowan fire was in its infancy, we didn't have a great deal of a footprint there, but now we certainly do," Nowra Fire and Rescue station commander John Dun said.

Strike teams from Sydney to the Victorian border have been battling the blaze around the clock.

"RFS are running the incident but we've had a very large presence supporting them," Captain Dun said.

There were three strike teams every shift day and night, with each team made up of four appliances with four crew on each appliance.

On Thursday, December 19, teams were still dealing with the Braidwood fire that has burnt more than 37,000 hectares.

He said Fire and Rescue were supporting RFS with property protection but also assisted with 4WD tankers.

On Wednesday, they formed a "control line" at Mount Kingiman, west of Ulladulla, to hold the fire back.

"We put in a backburn ahead of the fire to reduce the vegetation in front of the firefront," Captain Dun said.

"We've had a few fires in the last 12 months down that way.

"In August, 2018, we had a fire in the same vicinity."

He said in some ways the previous fires had assisted them, but in other ways it was a hindrance.

"The regeneration doesn't burn as well as we'd like," he said.

Captain Dun said a strike team from Victoria were doing a lot of night shifts to take pressure off NSW Fire and Rescue and RFS crews.

"It's greatly appreciated that our southern brothers and sisters have come to help us," he said.

He said Fire and Rescue crews were under "a bit of stress", like other emergency services, but "we're going OK".

"It's really testing us but ... everyone's coping OK," he said.

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