What can be a result of improperly vented gas appliances?

Improperly vented gas appliances can lead to the accumulation of harmful gases, particularly carbon monoxide, in enclosed spaces. Carbon monoxide is a colorless, odorless gas that is produced during the combustion of fossil fuels. When appliances such as furnaces, water heaters, or stoves do not vent correctly, they can release carbon monoxide, posing severe health risks, including poisoning. Symptoms of carbon monoxide poisoning may include headaches, dizziness, confusion, and even loss of consciousness, making it crucial to ensure that gas appliances are properly installed and vented to avoid these dangerous outcomes.

Other options, such as lower utility bills and improved air quality, are not likely outcomes of improper venting. In fact, faulty venting could potentially lead to higher utility bills due to inefficient operation or unnecessary energy consumption. Additionally, the presence of unvented carbon monoxide would significantly decrease air quality, not improve it. Thus, the primary concern with improperly vented gas appliances is the risk of carbon monoxide exposure and its associated dangers.