Are aware the risks of using unsafe chimney?
All chimneys should be inspected annually and swept when needed to remove byproducts such as soot and creosote. This will help to prevent flue fires and ensure that dangerous fumes can exit your home. Chimney sweep is needed to remove creosote deposits and other debris from chimneys and vents. Creosote buildup, debris and animal nesting in chimneys can lead to chimney fires or flue blockages and dangerous fumes can be forced into your home.
During a chimney fire temperatures inside the chimney often exceed 1100 degrees and this can destroy your chimney and may set your house on fire.
Although most people don't realize it, the air moving up your chimney works under the same set of physical principles as water flowing in a hose or pipe. When a fireplace chimney is full of hot air, it actually pulls air through the firebox. This pulling effect is called draft and it corresponds to the amount of pressure in a water hose - the only difference is that the air pressure is negative and the water pressure is positive (think of using a straw to drink with instead of to blow bubbles). Thus, chimneys are negative pressure systems.