Most sliders have tracks on the bottom and top, and runners for moving along the tracks. Screens are usually fixed. With no cranks, hinges, or other hardware for opening and closing, they tend to be sturdy.
Grit and debris buildup in the tracks can keep these windows from sliding easily. Tracks can also fill with water, so they often have weep holes for drainage. Clogged weep holes can lead to corrosion or rot.
Lifespan: 15-20 years