Casement windows are one of our most popular items of joinery, most are of "flush" design but many are "stormproof" style as well. One of the basic things we need to communicate between the the designer, craftsman and client is the handing of the casement. Thankfully it's very easy. First of all when discussing any item of joinery it is agreed we talk about it viewed from the outside of the dwelling, in the same way we read building plans or blueprints.
Then we apply a simple note to show the handing. The phrase that helps me understand how this works is "The arrow points to the hinge". You'll notice in the photos that two lines create a large triangle, it's apex is where you'll find the hinges. This should help you understand where your casement window handing. If you don't see arrow then you should assume the item is fixed or non opening.
Below you'll see a chart that's a shortcut on our casement window design system, it gives typical configurations of the most common windows although we regularly have to come up with an alternative as much of out work is unusual prototype work.
Using the codes on the chart I'll pick a few to further illustrate the point.
1A: Fixed Casement
6F: Left Hand Casement Fixed, Right Hand Casement Hung on the Right, Fanlight Hung on the top
13B: Left Hand Casement Hung on the Left, Two Central Casements Fixed, Right Hand Casement Hung on the Right.
I hope that illustrates well the handing of a casement window, if your're thinking of placing an order and are still unsure, never hesitate to ask!