Adapter for 2.5 inch exhaust hoses to exhaust to window sill. Top edge goes around window to reduce exhaust coming back through. Print as many extension panels as needed to fill window, one connector piece goes through each extension to keep them together. Print 2 extra connector panels to cover edges on the side. For an exact fit you can adjust the Z scale when printing to make it precise. The example printing I extended one panel by an extra 2 inches to make it fit perfectly. Just be sure to turn off uniform scaling so that you only scale in the Z direction. You cannot scale the panel that has the exhaust, but the extension panels can be scaled.