I would make a pair of square sheet metal caps that fit over the holes. Not knowing what now protrudes from the roof prevents details, but I would want a 4 to 6 inch standing edge upward from the inside of the port holes. This could be treated 2X8 material. I would have it be uniform in height above the tin of the roof (on a slant) The metal caps would be bigger than the port holes by an inch and come within an inch of the metal of the roof. I would use open foam ridge vent material to "pack" the edges between the metal roof and the cap, placing it between the sides of the cap, and the standing edge mentioned above. This would allow urethane sealant to be used to prevent water intrusion along the top edge and sides. where the roofing meets the standing edge. The effect would be moderate venting, while keeping out rain/snow, wasps and, varmints. Jim
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