Source 1: Who Cleans the Chimney?
1When wood burns in a fireplace or a wood stove, smoke rises up the chimney. As the smoke cools on its way up, it leaves behind black soot and a dark, sticky material called creosote. Little by little, creosote builds up on the inside walls of the chimney. If too much of it collects, it can catch fire. That is one big reason many families hire a chimney sweep.
2A chimney sweep's job is to clean out the soot and creosote. First, the sweep covers the floor and furniture near the fireplace with drop cloths. Then the sweep pushes stiff brushes up and down the chimney. The brushes are attached to rods that screw together, so the sweep can add rods until the brush reaches the top. A strong vacuum pulls the loose soot out of the fireplace so it does not drift into the room.
3Sweeps also look for problems. Many use a small camera on a long cable to spot cracks inside the chimney. If a sweep finds a crack, the chimney may need to be repaired before the next fire is lit. They check for nests, too, because birds and other animals sometimes build homes in chimneys. A metal cap on top of the chimney can help keep animals and rain out.
4The job has a long history. Long ago, many chimney sweeps wore tall black hats. In some countries, people still say that meeting a chimney sweep brings good luck.