Damper and exhaust system that maintains constant air discharge velocity

摘要: An exhaust system has an air duct having a charge opening and discharge defining flow path. A damper is mounted in the for maintaining constant velocity exiting opening. The opposing blades pivotally within duct. Each blade end that cantilevered fashion so free to move parabolic shape minimizes turbulence over reduces vibration. can be pivoted response change volume discharged through maintain desired of