The standard window mount Casa will fit in both vertical and horizontal windows.
For the standard casa the window should be at least 46" wide.On vertical windows it must slide open at least 20" and on the horizontal windows it must open up at least 20". .
If you have a window that doesn't meet these specifications, I can custom build a casa to fit your window. I can place the entrance anywhere on the inside of the Casa, plus if this will be a second floor mount, I can install the cleaning door on the inside portion of the Casa. By doing this there may be some odor when you clean the litter box but nothing like what your experiencing now.
Welcome to "Kitty Kat Casa" 
he entrance anywhere on the inside of the Casa, plus if this will be a second floor mount, I can install the cleaning door on the inside portion of the Casa. By doing this there may be some odor when you clean the litter box but nothing like what your experiencing now.