They allow airflow to go in one route and to avoid it in the alternative direction. They're manufactured from corrosion resistant extruded aluminum. By changing the damper position, operators can modulate pressure to satisfy the requirements of various procedures, stopping in excess of-pressurization or less than-pressurization which could compromise safety https://collinsjxbs.dgbloggers.com/37405933/dampers-for-industrial-sector-an-overview