Opposed blade dampers open up or close off air-flow. They fit snug into duct openings and blade manipulation is accomplished with a screwdriver. OBD’s are sold in whichever color we have in stock, either silver or black.
Opposed blade dampers are non-directional, as opposed to our directional louvers which can be adjusted to direct air in one of two directions.
Note: It is not practical to install both a damper and directional louver in a single duct opening. We recommend choosing either/or. If control of air volume is more important, choose the damper; If control of direction is more important, choose the louver.