The LRW Shutter is an all aluminum damper featuring an extruded aluminum frame with interlocking aluminum blades for maximum weather seal. Double panel shutters (LRW45 and larger) are constructed with a rigid ?T? section center member to prevent shutter blades from sticking. This shutter has nylon bearings on all movable linkage. A sturdy, extruded aluminum tiebar is connected exactly on the blade centers. Double panel shutters feature dual tie-bars (one for each panel). The LRW Shutter can be gravity or motor operated.