According to the American Iron and Steel Institute, the purpose of a blast furnace is to produce enough heat to extract iron from raw ore. Iron ore, coke and limestone are placed into a blast furnace and then heated unti... More »

Hot-blast wood furnaces don't use electricity to generate heat, but almost all newer models use electricity for various components. Most are also attached to electric thermostats. More » Home & Garden Heating & Cooling

A hot blast furnace has preheated air blown into it. The hot blast technique allows furnaces to operate at higher temperatures while increasing its capacity. This technique is considered one of the most important advance... More » Home & Garden Heating & Cooling

The most important parts of a furnace include the burner, heat exchanger, vent pipe, thermostat and blower. Although there are four distinct types of furnaces that have different parts, other important parts include an i... More » Home & Garden Heating & Cooling

The annual fuel utilization efficiency measures the efficiency of a furnace by comparing the annual heat output of a furnace to the total annual fossil fuel energy consumed by that furnace. The Federal Trade Commission r... More » Home & Garden Heating & Cooling

A gas furnace is a part of a heating system, the purpose of which is to convert gas to heat. Gas furnaces are most commonly used in residential systems in cold weather climates. More » Home & Garden Heating & Cooling

An oil furnace is an object that uses oil in the form of a mist to create heat. The furnace is made up of several smaller elements, including burners and controls. More » Home & Garden Heating & Cooling