When fireplaces burn, the heat is supposed to travel up through the chimney or vent and exhaust safely outside. During use of the fireplace oily residue is left behind and will stick to your chimney flue. Overtime, layers of creosote build up and become a danger to your home.
We recommend an annual cleaning to remove debris from your fireplace and chimney.
Photo from https://achimneyspecialist.com/facts-chimney-safety/chimney-and-venting-systems/anatomy-of-your-fireplace/