A backdraft damper permits the move in one way and will not alter the way or reduce the circulation. In the meantime, the balancing damper utilizes rotating shutters to control airflow and pace. Leave a Reply Multi-blade ventilation dampers offer you exact, variable control of airflow by air flow programs. https://air-control-dampers-for-h67001.blog5star.com/37218143/about-air-control-dampers-for-hot-climates