RDB dampers have adjustable opposed moving fins, are manufactured in any dimension and are suitable for use in air conditioning and ventilation systems. The selection of the appropriate dimensions is made according to the nominal dimensions of height and width of the mouth with which it is to cooperate.

RDB dampers can be made of aluminium, galvanized or stainless steel and copper :
RDB... : Aluminium fins & frame.
RDB... | C : Copper fins & frame.
RDB... | GL : Galvanized sheet fins & frame.
RDB... | I : Stainless steel fins & frame.