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Edmonds® butterfly single-disc and divide-disc dampers has been designed to allow flexible and reliable means of air movement control. 6-Inch Galvanized Sheet Metal Round volume damper with manual quadrant adjustment handle; Ideal for use in branch duct lines for adjusting supply or return A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV Manual dampers are turned by a handle on the outside of a duct. Automatic dampers are used to regulate airflow constantly and are operated by 27 Feb 2013 Shop our selection of Dampers in the Heating, Venting & Cooling Department at The Home Depot. A complete line of damper products for fire and smoke control in life safety systems and for A wide selection of electric, pneumatic, and manual actuators. Description. Model: MBD. Manual Balancing Damper with adjustable control. MBD Data Sheet. Sizes: 8?8 – 36?36 (custom sizes available and will ship 4 days Manual Duct Damper allows you to balance airflow. It is recommended for placement directly into the fume hood collar and for direct connection to LabconcoFrom light operations to heavy-duty industrial applications and from backdraft control to indoor air quality control, Ruskin provides the perfect control damper.