A:
Yes and no. Yes because it will fit, as it fits in my 41" wide window. No because the side baffles do not extend out far enough to reach both sides of the window, they are about 6" short.
My solution was to simply cut a small piece of wood to fit on one side. I found some white shelf material at a local hardware store for that. Then I slid the wood into the window, attached the baffle to the sash (sliding window) and frame on the bottom, and it holds the wood in place. This was really easy, and only took a few minutes with a saw.
You can also use a piece of cardboard and blue painters tape (so it doesn't leave residue when removed) if you want a simple or temporary fix. :)