casement windows all open out side but screen is inside .you can open your casement window from left to right or from right to left and also weather strip makes this beautiful window completely sealed and insulated.you can fit this window in any opening with different combination . teh best advantage of this window is that you can clean it from inside because it opens 90` and it gives you room to clean the back side of window from inside . Casement windows have the perfect design for living rooms, bedrooms and any other living spaces in which you may want an unobstructed view as well as an excellent airflow. The vinyl frame provides these windows with a visual appeal that will add style to any home.