Casement and Awning windows seal extremely well. They provide clean lines and unobstructed views. Casement windows are attached to the frame by hinges. If the hinges are at the top of the frame, then it is called an Awning window.
Casement windows are opened with a crank located at the bottom near the window ledge and the windows open outward. The windows are locked with a multipoint locking mechanism that pulls the window in in two or more locations depending on the height of the window.
French casement windows work the same except that they do not have a center mullion which provides an unobstructed view to the outside when both windows are open. A center locking handle secures the windows at both the top and bottom.
Push out casement windows do use the cranking mechanism typically found on casement and awning windows. These windows are manually opened, closed and locked using a single handle.