Which of the following is a common sign of inadequate chimney ventilation?

A common sign of inadequate chimney ventilation is that it can lead to a range of issues, all of which are highlighted in the options provided. When there is insufficient airflow through the chimney, burning wood produces more creosote, resulting in excessive soot accumulation. This buildup can be hazardous, as it increases the risk of chimney fires due to the flammable nature of creosote.

Inadequate ventilation can also cause strong odors when wood is burned. Poor airflow can lead to incomplete combustion, which results in the release of volatile organic compounds and other byproducts that can create unpleasant smells. This is often a sign that smoke and gases are not properly exiting the chimney.

Moreover, frequent chimney fires can be a direct consequence of inadequate ventilation. Without proper airflow, the buildup of flammable materials like creosote can ignite, leading to dangerous and destructive fires within the chimney.

Therefore, all of these symptoms are interconnected indicators of inadequate chimney ventilation, making the selection that encompasses all these signs the most comprehensive choice.