I have a variety of sizes of trailer house windows, ALL ALUMINUM so no wood to rot away. Some crank open pivoting at the top and opening at the bottom. They are single tier about 12"x36" and some are three tier so three "12x36" panes that open in unison. Other windows are sliding side to side. These would all work well for garden sheds, green houses, or any other outbuilding projects. Cheap or free, depends on who's removing them.