Patent ID: 6071188
Filing Date: 2000-06-06
Classification: F16K

Abstract:
A damper for maintaining a constant air velocity through an air exhaust duct opening comprisingan air exhaust duct having a charge opening and a discharge opening defining an air flow path,opposing damper blades pivotally mounted within the air exhaust duct and within the flow path, each damper blade having an end that is pivotally mounted in cantilevered fashion in the duct so that an opposing end is free to move within the duct,wherein each damper blade is parabolic in shape to minimize the air turbulence over the damper blade, improve plume shape and reduce vibration, andmeans for pivoting each damper blade within the duct in response to a change in air volume discharged along the flow path through the duct to vary the discharge opening through the duct and maintain a desired velocity of air as it exits the discharge opening.