Andersen G636 400 Series Gliding window full 2 piece screen in white color. This screen comes in 2 pieces half of the screen covers the passive sash and the other half covers the active sash. The 400 Series gliding window was introduced in 1991 and is still in production today. This window is unique in that the sashes pivot slightly away from each other before they slide past one another. Both sashes are operable. This screen measures 34-9/16" wide by 40-11/32" high.