A HVC unit is a type of ventilation system that is designed to provide a high level of air quality in an enclosed space. It is a combination of a heat exchanger, a fan, and a filter. The heat exchanger is used to remove heat from the air and the fan is used to circulate the air throughout the space. The filter is used to remove dust, pollen, and other airborne particles from the air. The HVC unit is designed to provide a higher level of air quality than a standard ventilation system, as it is able to filter out more airborne particles. It is also more energy efficient than a standard system, as it does not require as much energy to operate. The HVC unit is often used in commercial and industrial buildings, as well as in residential homes. It is an effective way to ensure that the air quality in an enclosed space is maintained at a high level.