Duco. DucoBox Energy is a balanced ventilation unit with heat recovery. The unit mechanically supplies fresh air to the home and mechanically extracts polluted air from the home using integrated fans. In doing so, heat is recovered from the extracted air and transferred to the supplied air. The optional integrated 2-zone control with demand control ensures extremely quiet, intelligent and energy-efficient operation. Control components can be registered on the DucoBox Energy. The DucoBox Energy is equipped with frost protection (with or without heater), a bypass function and constant flow. The semi-automatic commissioning ensures fast installation of the unit. Available in left or right version. ErP Ready.