how did furnace work
A furnace is a heating device designed to generate heat and distribute it throughout a building or space. The specific way in which a furnace works can vary depending on its type and fuel source, but the basic principles are generally the same.
In a typical gas furnace, for example, natural gas is piped into the unit and ignited by a pilot light or electronic ignition. The resulting flame heats up a metal heat exchanger, which in turn heats the air that is blown over it by a blower fan. The warm air is then distributed through a series of ducts and vents to various parts of the building.
Electric furnaces work slightly differently, using electrical resistance heating elements instead of a flame to heat up the air. These elements are made of a special alloy that resists the flow of electricity, causing them to heat up when a current is passed through them. The warm air is then distributed in the same way as with a gas furnace.
Other types of furnaces, such as oil or propane furnaces, operate on similar principles but use different fuel sources to generate heat. In general, furnaces are designed to be efficient, safe, and reliable sources of heat for homes and other buildings.