3M Black 19in Privacy Filter PF19.03M Black 19in Privacy Filter PF19. 0 Use a 3M Privacy Filter to shield private information from inquisitive eyes. This frameless filter uses 3M micro louvre technology, which makes it extremely difficult to spy on what is on your monitor by dimming the screen for viewers to the side. With a choice of two attachment techniques, it is simple to apply and may be taken off and reapplied as needed. For employees handling sensitive data, it is the best