A backdraft damper allows the movement in a single direction and would not change the direction or lessen the stream. Meanwhile, the balancing damper takes advantage of rotating shutters to control airflow and pace. Go away a Reply Inlet vane dampers support control the amount of air enters a fan, https://aircontroldampersforengin89001.bloggactif.com/38007989/the-ultimate-guide-to-air-control-dampers-for-hot-climates