What type of appliances use oil as fuel and need specific air for combustion?

Oil-fired appliances are specifically designed to use oil as a fuel source for combustion. These appliances include systems like oil furnaces and boilers, which require a proper combustion air supply for efficient and safe operation. The combustion process in these appliances involves mixing oil with air to create a flame that generates heat, which necessitates specific air quality and quantity to ensure complete combustion. This is crucial not only for efficiency, but also for minimizing harmful emissions and preventing incomplete combustion, which can lead to dangerous byproducts.

The need for specific combustion air distinguishes oil-fired appliances from electric, gas, and hybrid appliances, each of which relies on different fuel sources and may not have the same requirements for air quality and combustion processes. Electric appliances, for example, do not involve combustion at all, and gas appliances use natural gas or propane, which have different combustion needs. Hybrid appliances may combine multiple fuel sources but do not specifically necessitate oil for operation.