The DMD duct mounted drum louver series delivers air with extremely long throws, which makes them ideally suited for installation in large enclosures. They provide both horizontal and vertical air stream control. Controlling length of throw and its direction is made possible by the adjustable drum and vane design. The long throw is adjusted by the louver vanes while air directional control is obtained by rotating the drum. The drum rotation features 80° angular adjustment of the jet centerline (40° up from centerline to 40° down). The ability to mount the DMD directly to spiral or round duct work without the use of costly transition taps makes the DMD ideal for exposed ceiling installations.