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building design use
...systems of industrial buildings are usually simple, involving only winter heating and possibly humidity control if the manufacturing process is sensitive to it. A commonly used element is the unit heater, in which an electric fan blows air through a coil heated by hot water, steam, electric resistance, or gas combustion and provides a directed supply of warm air where needed. Another...
central heating systems
Many industrial buildings are heated using a special form of emitter called a unit heater, which consists of (1) an arrangement of finned tubes through which hot water or steam circulates and (2) an electric fan that forces air over the tubes. The forced convection results in a rapid rate of heat transfer. Unit heaters can be mounted in units either above the floor or on it.
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