If you have a corner masonry fireplace and if your chimney is connected to your fireplace through a horizontal pipe, fire risks are very high. Two reasons for this. First, since the install of your fireplace, no equipment could remove the soot accumulation at the base of the chimney. Then, it is impossible to completely sweep the horizontal section of the pipe. Stop using your heating system and have an insulated cleanout door installed. The choice of this type of trapdoor is crucial to avoid smoke discharge problem in your home.