What can excessive heat in a venting system lead to?

Excessive heat in a venting system can lead to corrosion and safety hazards, making it the correct answer. When the temperature in the venting system rises beyond normal operating ranges, it can cause the materials used in the vent to deteriorate over time. This deterioration may include the breakdown of metal components and sealing materials, potentially leading to exhaust leaks. Such leaks can allow harmful combustion gases, including carbon monoxide, to enter living spaces, posing serious health risks.

Furthermore, excessive heat can create a fire hazard, as it may ignite nearby combustible materials or components if they are not rated to handle high temperatures. Thus, managing heat levels in a venting system is critical for maintaining the safety and integrity of the entire combustion appliance system.