Andersen double hung full screen 3456. This screen will fit either Perma-Shield Narroline windows or Tilt Wash double hung windows manufactured AFTER 1980. In 1980 Andersen changed the location of the screen wing blades on the screen. The windows manufactured after 1980 will have a screen channel groove along the full length of each side jamb. The groove is made to accept the screen clip or wing blade to hold the screen in place. This screen measures 39-7/8" wide by 66-27/32" high.