3M™ Privacy Filter for 19in Monitor, 5:4, PF190C4B3M Privacy Filter for 19in Monitor PF190C4B The 3M Privacy Filter for 19 inch monitors with a 5: 4 aspect ratio (PF190C4B) is engineered to protect your sensitive information while preserving screen clarity and user comfort. Designed for busy professionals who work with confidential data, this privacy filter blocks side viewing angles so colleagues or passersby cannot glimpse your screen. Its ideal for offices, libraries, cafes, and shared workspaces