What are the potential consequences of insufficient venting in gas appliances?

Insufficient venting in gas appliances can lead to the accumulation of harmful gases, specifically carbon monoxide. This colorless, odorless gas is a byproduct of gas combustion and can be extremely dangerous when not properly vented. If there is inadequate venting, carbon monoxide may build up in the living space, posing a severe risk of poisoning to anyone nearby.

Additionally, insufficient venting can create fire hazards. Unvented appliances can cause overheating and increased pressure buildup, which may lead to fires or explosions if flammable materials are present or if the appliance malfunctions.

The other options suggest benefits such as improved energy efficiency, increased appliance lifespan, and enhanced performance. However, these are unlikely outcomes of insufficient venting. In fact, poor venting often results in reduced efficiency and performance, as the appliance may not operate optimally when exhaust gases cannot escape as intended, ultimately leading to premature failure and safety issues. The primary concern with inadequate venting remains the serious health and safety risks associated with carbon monoxide and fire hazards.