PF14.1 fits standard screen Notebook computers with a 14.1" diagonally measured viewable screen; actual filter dimensions are 8.44" high x 11.25" wide. This filter is designed for Non-widescreen laptop computers with screens that appear more square than rectangular and have a 4 x 3 aspect ratio. 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.