TIME TO PREPARE: The next 36 hours will key to the firefight.
TIME TO PREPARE: The next 36 hours will key to the firefight.

FIRE UPDATE: Blaze moves slowly toward Maryvale

EFFORTS to control the Main Range fires ramped up today with firefighters strengthening containment lines in Swanfels and North Branch.

Multiple crews were on scene throughout the day and night to monitor the large-scale fires and fortify the defensive line, according to Queensland Fire and Emergency Services chief superintendent Mark Stuart.

"They're trying to ensure any existing or created containment lines are effective," Mr Stuart said.

Favourable weather conditions have allowed for tightly controlled backburning measures.

Smoke is predicted to affect areas surrounding North Branch for the next two or three days as rural firefighters work on containment, according to Rural Fire Service area director for West Moreton Paul Storrs.

"QFES will be setting up infrastructure for communication in that area and those noticing it should stay away from the tower," Mr Storrs said.

At South Branch Rd the fire is slowly moving towards the township of Maryvale.

"We have constructed a fire break between the township and the fire," Mr Storrs said.

"The fire is likely to come up to the containment line within the next 36 hours."

The Freestone Valley and Swanfels fire continues to move along the ridge line, spilling over into both sides of the valley.

"Crews are working with local landholders to monitor the fire as it comes out," Mr Storrs said.

"There's an expectation of it moving down into the valley within three to five days.

"QFES will increase patrols and resources to manage that fire appropriately, but we expect there will be fire activity in the local area for up to two weeks."