• Consists of an upper and lower storm panel and an insect screen all in one unit.
• The frame is a low-maintenance prefinished aluminum.
• Designed to fit unit size 18410 - dimensions are 19 13/16" wide by 58 27/32" high.
• They are energy efficient and ideal for sound reduction for locations near airports, busy roadways, or other noisy environments.

A combination unit is a self-storing accessory that easily installs to the exterior of 200 Series narroline® double-hung, 400 Series double-hung, and woodwright® double-hung windows.