A casement window is a good choice when a room needs ventilation, because it opens on its side at the turn of a crank so it’s easier to operate than lifting a traditional double-hung window. We’ve used a casement in small bathroom makeovers, because their narrow shape takes up so little wall space but allows opening and closing with relative ease.
Like any good window design a casement closes tightly and prevents air infiltration with the bonus feature of a foldaway handle that won’t interfere with shades or blinds. You’ll find casement windows, made of wood and vinyl and in a variety of sizes and shapes, sold at home centers, lumberyards and window companies.