PF24.0W fits widescreen desktop LCD monitors with a diagonally measured 24.1" viewing screen; actual filter dimensions are 20.43" wide x 12.78" high. This filter is designed for widescreen desktop LCD monitors with screens that appear more rectangular than square. Notebook privacy filters keep confidential and private information private. Utilizes 3M(TM)'s microlouver privacy technology so only persons directly in front of the monitor can see the image on screen; passersby see only a dark screen.