The DV72 is designed to provide both essential ventilation in air tight homes. It has high efficiency heat recovery and the unit fits a standard 600m cupboard because of its compact lightweight design.The DV72 EC is controlled by a three speed manual switch with two remote sensor inputs available for “on demand” activation. 100% variable airflow rate settings on installation to suit requirements.Five airflow settings, maximum 280m3 /hr.Heat recovery up to 91% efficiency