Branch take off damper blade the air ductwork accessories of Volume Control in commercial HVAC / ventilation.

         1.  ten sizes ranging from 4 to 20 diameter .
         2.  manufactured from galvanized sheet metal or aluminium.
         3.  wing out locking on both ends of blade with indicator arm showing

              angle of blade .
           

      Applications

         1.  suitable for starting collars, branch take-off\'s and sleeves

         2.  The accessories for air duct work in the HVAC and ventilation system.