Double-Hung windows have two operating sash that move up and down allowing for ventilation on the top, bottom or both..

• Manufactured from 1968 to 2012
• Some Perma-Shield® Narroline® Windows will have an identification label or glass etching containing a unique Product ID. The Product ID on Perma-Shield® Narroline® Windows will be located at the top of the window frame or etched into the glass.