What is a potential risk associated with improperly vented dryers?

Improperly vented dryers can lead to the dangerous buildup of carbon monoxide, especially if the dryer is gas-powered. When a dryer is not vented correctly, exhaust gases, including carbon monoxide, can seep back into the living space rather than being expelled outside. Carbon monoxide is a colorless, odorless gas that can cause serious health issues or even be fatal, making this risk particularly significant in homes where proper ventilation is not ensured.

The other options may seem appealing, but they do not relate to the consequences of poorly vented dryers. Increased drying efficiency, reduced energy bills, and enhanced appliance longevity are typically associated with well-vented and maintained dryers. Proper dryer venting helps ensure optimal performance and safety, which is why addressing the risk of carbon monoxide buildup is critical in dryer operation and maintenance.