Many have opted to remove the furnace (which was an option) that came in their Scotty. I personally would do that as it is an old propane appliance and there are much better solutions with CO2 protection available today. Removing the furnace and its vent though, can leave you with a hole on the side of your Scotty. Cover the actual hole with flashing and then over that, for a better appearance, add a vent cover.

Tom Bernot's solution, using a vent commonly available at home repair stores