Andersen Tilt Wash windows were first introduced in 1992. It was known as the DC window (Designed for Cleaning) and was made with tilt in sash so that it would be easier to clean. It went through several design upgrades and is now known as the Tilt Wash window. The Tilt Wash double hung window does not have any visible cords to help hold the sash up. The sash balances are hidden behind the sash. This window has compression fit jamb liners that keep the jamb liners tight against the sash. The exterior frame dimensions are the same of the window unit are the same as the Narroline, and the same screen will fit both the Narroline and the Tilt Wash windows. To tilt the lower sash in you need to raise up the lower sash several inches then slide the "wash assist" into place. The wash assist is a piece of vinyl that slides in the window track. It slides down the track and is pushed between the sash and the jamb liner. This action pushes the jamb liner away from the sash and easily allows the sash to tilt in. The easiest way to identify this window is to look for the Wash Assists that will be clearly visible in the track. Another way to identify this window is by the glass size, which is slightly different that the Narroline window.