Pella 250 Series 71-1/2-in x 47-1/2-in x 3-1/4-in Jamb Left-operable Vinyl White Sliding Window Half Screen IncludedThe Pella 250 Series vinyl sliding windows effortlessly glide open and boast increased security and privacy features. With SunDefenseTM Low E insulating glass and Argon gas, these windows let in ample light while preventing excess heat from entering the home, resulting in cooler summers and warmer winters. One sash moves horizontally while the other remains stationary, enhancing functionality. Pella's vinyl is specifically designed to resist fading,