March 6th, 2011 
Adriana Noton Within American and Canadian English, the term furnace is used to describe a device for heating. The word emerges from the Latin word for oven – fornax. In British English, heater or boiler is used instead and the word furnace is used exclusively to define an industrial furnace. An industrial furnace can smelt. They can be useful at chemical plants and oil refineries. These devices can be used for more than household heating. In fact, an age-old furnace excavated in Balakot, was likely employed for the development of ceramic items.
There is an assortment of furnaces. The differences between the kinds are found in the size, shape, method of fuel supply and primary purpose. Household, metallurgical, outdoor wood-fired boilers and industrial process are the most commonly used types.
A household furnace is a type of major appliance. Generally they are permanently installed in a home. Within the United States, natural gas is used to fuel these devices. Other fuel sources include liquefied petroleum gas, fuel oil, wood and coal. There are three primary components: controls and safety devices; blower and air movement; and burners, heat exchanger, venting and draft inducer. Modern structures can be classified as condensing or non-condensing, depending upon their ability to extract heat from exhaust gases.
These structures use an intermediary distribution system to give off heat. Steam, hot water and air are the most common systems. With air convection, fans circulate air throughout the rooms of the house. At the same time, it cold air is pulled into the device and reheated before being re released. Air can also be circulated through ductwork, which is sheet metal or plastic flex duct. An advantage of an air system is that an air conditioning system can be easily installed by simply attaching a cooling coil to the device. Systems that utilize steam and hot water are often called boilers. Boilers eliminate the need for a separate water heater because they can produce hot water for the household. If the boiler breaks down it will eliminate the heating and domestic hot water.
In metallurgy, several specialized structures are used. Some are used for smelting. An example is the blast furnace, which can reduce iron ore to pig iron. There are also steelmaking furnaces such as puddling, basic oxygen and electric induction. Metallurgical devices are often used in foundries to remelt metal. Some can heat treat metal for slitting and rolling mills. Vacuum furnaces can heat metal materials for brazing, sintering and other processes.
An industrial furnace has the ability to serve as a reactor or create heat for a specific process. It will vary in appearance. The heating duty, function, method of introducing air and fuel type will influence its framework.
There are different sections of these devices: radiant, convection, soot blower, burner and flue gas stack. The set up of each of these areas may be different, but they all serve the same functions. Overall, the most important design element for these structures is insulation. Adequate insulation will prevent extreme heat loss.
Outdoor wood-fired boilers Toronto self-contained structures that connect to the building they heat through underground pipes. They are commonly used in the northern parts of the United States. They are praised for being more cost efficient than heating devices that use oil, gas or electricity.
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