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.
The dampers are constructed by aluminium extruded
section T6 with aerofoil design to reduce noise level. food grade
ruber gasket is provided to seal all leaks.