Motorized masking system for masking NTSC video format to HDTV format or letterbox format. System can be installed over Da-Lite's Imager, Da-Snap or Perm-Wall or rear projection screens or over any other permanently wall mounted screen. Masking fabric will mask the screen equally from top to bottom. Masking fabric will close symmetrically to correct format. Frame available with Pro-Trim finish for an upcharge. Pro-Trim is a fabric frame covering that aesthetically enhances the appearance of the installation while absorbing light that surrounds the viewing area.