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You can't really or rather you probably shouldn't. They are hollow and the bottom cut edge will rust no matter what you do to it. Normally, you would make the opening taller. If you had to, cut it with an abrasive blade in a circular saw if possible. This will give you a more even cut. I would either cut a board to fit inside the door and glue it in place, or clamp a 2x4 on either side across the face of the door, making sure thickness of the door was the same in the middle and put spray foam insulation in the bottom. Up at least 6 inches. Trim off the excess that comes out after it has hardened. This should seal the door and glue the two faces together.

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