A dedicated outdoor air system (DOAS) is a unit supplying cooled, dehumidified outside air to a building in the summer and heated outside air in the winter. Greenheck’s comprehensive line of outdoor air units is designed to meet a wide range of heating, cooling, dehumidification, and ventilation requirements. These rooftop units deliver up to 100% outside air and are ideal for any variable air volume or dedicated outdoor air system (DOAS) application. Pre-engineered and factory-tested rooftop ventilator units can be specified with a variety of options and can also include a total enthalpy wheel or total enthalpy core to meet performance requirements while offering significant energy savings.