The 121207 is a ceiling opening trim kit. Designed for ceiling-recessed installation (for use in an acoustical, drop ceiling only) of Targa and Premier electric projection screens. Assembles quickly with fasteners provided. The kit attaches to the screen endcaps and forms a finished slot in the ceiling allowing for passage of the projection screen surface. Painted white to match the ceiling. Slot includes finished flange to accept acoustical ceiling tile or grid. Slot measures 2-1/8" (54mm) in depth. Once installed the finished slot length is equal to the Targa or Premier screen case length. Can also be used on the manual Luma 2 screen. Not recommended for the Luma 2 with AR.