The Caryaire round (butterfly type) control damper, model CDR, has a circular single skin blade mounted on a shaft inside a cylindrical sleeve.
The sleeve has two rolled, stiffened beads for easy sealing of spiral ductwork joints, and a gasket inside seals the blade in the closed position.
Model CD2020-A is an opposed blade volume control damper with 3V style blades.
Model CD2018 – A/B is an opposed blade volume control damper with 3V style blades.
Model CD1818-A is an opposed blade volume control damper with 3V style blades.
Model AU350 is an opposed blade volume control damper with extruded aluminium airfoil blades.
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