Andersen® Narroline® Conversion Kits are used to convert your existing Andersen Perma-Shield® Narroline® double-hung window into a convenient 400 Series Tilt-Wash window. You must complete step 1 to find the correct Narroline® window Conversion Kit. Step 1: Find and select your window number under NARROW YOUR SEARCH. If you cannot find the number on an insect screen please measure and select your visible glass dimensions on your lower sash. Step 2: You can further narrow your search by selecting your sash color. Step 3: Select the type of glass for your replacement sash. If you need help in determining your glass options visit our Learning Center.