I am replacing an old metal basement window with a vinyl one and I am running into a few confusing problems. 1st, the opening is only 13x31 and the smallest window I have found available is 14x32. The old window has a metal frame, but I cannot see any way for the frame to be removed. There are no screws holding it in, and it appears to be one piece. Will I have to try and cut this metal frame out with a saw? I am hoping that the new opening will accommodate the new window, but I am not sure. I am not worried about having to replace with an egress window since there is a walk-out slider near the window.
Originally, I was going to build a frame for the inside of the basement around the opening an simply set the window against the frame and secure it using the fins on a new construction window.
Now I am thinking that a replacement window set into a (hopefully) larger space from the outside is the better option. Any advice anyone?