What is the difference between a two-track and three-track storm window?
The name gives a clue. The two-track storm window has two tracks. The first track holds the top non-sliding glass panel and the bottom non-sliding screen panel. The second track holds the bottom glass panel which slides. All glass and screen panels are removable. The three-track window has three tracks. All three panels slide (2 glass, 1 screen), allowing ventilation from the top or bottom of the window.
