A backdraft damper will allow the flow in one route and doesn't alter the course or reduce the stream. In the meantime, the balancing damper utilizes rotating shutters to control airflow and velocity. Leave a Reply Multi-blade ventilation dampers offer precise, variable control of airflow by way of ventilation methods. https://air-control-dampers-for-h03578.humor-blog.com/35370543/5-tips-about-air-control-dampers-for-hot-climates-you-can-use-today