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B C G H I L N O P R U
H HE HV

HVAC

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 addition to providing for smoke control, maintaining pressure relationships between spaces, and providing fresh air for occupants. In modern building designs, the design, installation and control systems of these functions are integrated into a single "HVAC" system.

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