What condition can be caused by improper installation of a chimney?

Improper installation of a chimney can lead to a range of conditions that compromise both safety and efficiency. When a chimney is not installed correctly, it can create a perfect environment for creosote buildup, back puffing, and flue gas spillage to occur.

Creosote buildup happens when combustion gases cool too quickly in a poorly designed or incorrectly installed chimney system, leading to the formation of tar-like deposits that can ignite and cause chimney fires.

Back puffing refers to the situation where smoke and gases flow back into the living space rather than being vented outside. This is often the result of insufficient draft, which can be caused by improper chimney height or misalignment, affecting the chimney's ability to draw air effectively.

Flue gas spillage occurs when the combustion byproducts do not exit the chimney as intended. Factors such as an obstructed flue, incorrect sizing of the flue, or a lack of proper ventilation can lead to flue gas spilling back into the home, posing serious health risks due to carbon monoxide exposure.

Therefore, the choice encompassing all these conditions accurately reflects the potential hazards associated with improper chimney installation, making it the most comprehensive and correct answer.