My parents put in a Harman woad coal add on the beginning of winter. They run it every day. The smoke it emits from the chimney is either black or dark and never goes up but rather down the roof and side of the house and it smells awful! Even the inside of the house is starting to smell like a smokers house. They had it professionally installed and when they questioned the smoke they were told that their chimney was too short so they added a pipe to it and it still is a gross billowing smoke. My children are exposed to this everyday since my mom is my day care and I'm starting to worry about their health. It is getting to the point where I can't even get the smell out of their clothes! Is there something wrong with their stove? They have cleaned their chimney and that helped a little with the color of the smoke but it still billows in the air.