Abstract: A vertical louver assembly of the type designed to movably support a plurality of vertically oriented louvers from a horizontally oriented housing and accompanying track structure and a tilt rod extending along the length of the housing. Each louver is supported by a carrier assembly itself including a carrier frame structured to accomplish collective positioning of the louvers along the length of the housing and also in a rotatable orientation about their own longitudinal axis through operation of the tilt rod as well as other control facilities. Each carrier frame includes a biasing assembly disposed and structured to force gear elements into mating engagement with one another and a clutch assembly disposed and structured to allow for realignment of any louver which has become inadvertently disconnected without damage thereto.