1) " Heater" -- As it applies to Inline Heater HVAC may also stand for High-voltage alternating current HVAC is an initialism that stands for "heating, ventilation and air-conditioning ". This is sometimes referred to as climate control. These three functions are closely interrelated, as they control the temperature and humidity of the air within a building in additionto providing for smoke control, maintaining pressure relationships between spaces, and providing fresh air for occupants. Inmodern building designs, the design, installation and control systems of these functions are integrated into a single "HVAC"system. Contents 1 Heating 1.1 Central heating 1.2 Local heating 2 Ventilation 2.1 Natural ventilation 2.2 Forced ventilation 3 Air-conditioning 4 Thermostats 5 See also 6 External links Heating Heating systems may be classified as central or local. Central heating Central heating is often used in cold climates to heat private houses and public buildings. Such a system contains acentral boiler, furnace or heat pump to heat water, steam, or air; piping or ductwork to distribute the heatedfluid, and radiators to conduct this heat to the air. The term radiator in this context is misleading, since most heattransfer from the heat exchanger is by convection, not radiation. The radiators may be mounted on walls, or buried in the floor to giveunder-floor heating. When so mounted it is often referred to as "radiant heating".All but the simplest systems have a pump to circulate the water and ensure an equal supply of heat to all the radiators. Theheated water is often fed through another heat exchanger inside a storage cylinder to provide hot running water. Forced air systems send air through ductwork. The ductwork can be reused for air conditioning and the air can be filtered orput through air cleaners. The heating elemen...
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