Blade dampers produce considerably less sound and are available in two varieties: parallel and opposed dampers. Parallel blade dampers: Their blades move in the same way and manage the airflow. Agricultural: Perform an important purpose in agricultural programs together with controlling airflow via grain dryers to optimise grain drying efficiency, https://emilianoqixnb.buyoutblog.com/36586766/air-control-dampers-for-engine-sheds-fundamentals-explained