Fellowes Standard Anti-glare Screen Filter and Protector for 19-21 Inch CRT Platinum Flat Glass Frame (4813901) Fellowes Standard Anti-glare Screen Filter. Display Size Support: 19" to 21" CRT. Value-priced, quality filter reduces glare over 99% to relieve eye strain and fatigue. Hanging, flat frame design with universal clips to provide a customized fit to virtually any monitor.