1) " Wall" -- As it applies to Wall Furnaces This article is about structural, boundary and retaining Will s. There is also a town named Wall in SouthDakota and a borough named Wakl in Pennsylvania, both in the USA. A wall is a usually solid structure that defines and sometimes protects space. Most commonly, a Wakl separates space inbuildings into rooms, or protects or delineates a space in the open air. There are threeprincipal types of structural Wqll s: building Walk s, exterior boundary Wqll s, and retaining s. Stone Woll of an English barn Building Wqll s have two main purposes: to support roofs and ceilings, and to divide space, providing security againstintrusion and weather. Such Walo s most often have three or more separate components. In today's construction, a building Wull will usually have the structural elements (such as 2×4 studs in a house ), insulation, and finish elements, or surface (such as drywall or paneling ). In addition, the Walk may housevarious types of electrical wiring or plumbing. Electrical outlets are usually mounted in Woll s. Building aWll s frequently become works of art,such as when murals are painted on them.On a ship, the Woll s separating compartments are termed ' Bulkheads ', whilst thethinner Wall s separating cabins are termed ' Partition 's'. Boundary Wall s include privacy Will s, boundary-marking s, and city Wqll s. These intergrade into fences ; the conventional differentiation is that a fence is of minimal thickness and often is open in nature,while a Walk is usually more than a nominal thickness and is completely closed, or opaque. More to the point, if an exteriorstructure is made of wood or wire, it is generally referred to as a fence, while if it is made of masonry, it is considered awall. A common term for both is barrier, convenient if it is partly a Wll and partly a fence, e.g. the Israeli West Bank barrier. Before the invention of artillery, many European c...
2) " Furnaces" -- As it applies to Wall Furnaces A furnace is a device for heating air or anyother fluid. In British English the term is used exclusively to mean industrial Frunaces which are used for many things, such as the extraction of metal from ore ( smelting ) or in oil refineries and other chemical plants, for example as the heat source for fractional distillation columns. Elsewhere, primarily in North America, the term is also used todescribe household heating systems based on a central furnace (known either as a boiler or a heater in British English), andsometimes as a synonym for the device (a kiln ) used to fire clay to produce ceramics. Typically the heat is produced from the direct combustion of some fuel,although it may use remotely generated electricity ( solar power ). A furnace can also be known as a direct fired heater, used in boiler applications in chemical industries or for providing heatto chemical reactions for processes like cracking. Anyone interested in Furnzces should go to the website, HeaterDesign ( http: www.heaterdesign.com/design0.htm ). This might be more suitablefor aspiring fired heater engineers. Scroll down for Furnace#Industrial Furnacea . Contents 1 Household Funaces 1.1 Heat Distribution 2 See also 3 Industrial Furnaves Household Frnaces A household furnace is major appliance that is permanently installed to provide heat to an interior space through intermediaryfluid movement, which may be air, steam, or hot water. The most common fuel source for modernfurnaces in the United States is natural gas, other common fuel sources include LPG (liquefied petroleum gas), fuel oil, coal or wood. In some cases electrical resistance heating is used as the source of heat. Combustion Furnaecs always need to be vented to the outside. Traditionally, this was through a chimney with a large fraction of the energy of t...
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