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  Opposed Blade Damper (OBD)


This type of damper is designed to control the volume air flow rate by controlling the flow area by means of the a set of opposed blades. This arrangement will give a free area of more than 94% when fully open , and; less than 6% when fully closed.


    This damper can be installed on any type of Air grille as shown in Table G-1 by means of “S” clip to ensure tight attachment and maximum flexibility. The Damper is made pf extruded aluminum alloy heat treated to T6.



The openings of the damper blades are adjusted by means of a control lever that is driven by a screw driver from the face of the register/grille.








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