Andersen 531 Narroline Sash Balancer Category_Perma Shield Gliding (1968-Present) This sash has an unobstructed

This sash has an unobstructed glass size of 27 inches wide by 27 15/16 inches high

This sash has a visible glass size of 28 7/16 inches wide by 35 15/16 inches high

This screen measures 21-5/16" wide by 30-1/2" high

Andersen DH3456C Combination Storm and Screen Unit - Sandtone Color

Andersen 531 Narroline Sash Balancer Category_Perma Shield Gliding (1968-Present) This sash has an unobstructedAndersen 531 Narroline Sash Balancer Works with Perma Shield Narroline Double Hung Windows manufactured from 1968 to Present. Sash balancers are metal boxes that contain a nylon cord under tension. The balancer number is a code for the tension and the cord length. The proper balancer must be used to maintain the lower and upper sash in an open position. If you replace one balancer you should replace both balancers. Note: For instructions on how to