Why is maintaining proper exhaust efficiency important?

Maintaining proper exhaust efficiency is crucial primarily to prevent the release of harmful gases. When combustion appliances operate efficiently, they effectively expel combustion byproducts, such as carbon monoxide and other pollutants, out of the living space. If exhaust systems are not functioning properly, these dangerous gases can accumulate indoors, posing significant health risks to occupants. Ensuring optimal exhaust performance safeguards not only the health of individuals but also contributes to a safer indoor environment by facilitating the complete combustion of fuels.

The other options, while they may have secondary effects or benefits, do not directly address the primary safety concern related to exhaust efficiency like the prevention of harmful gas release does.