"Converts any number of fish to smoked fish, and up to 2 meat to 4 francs each."
You may convert any number of fish to smoked fish here. You don't need to convert all of the fish you have. Also, you don't need to pay energy for the conversion. Additionally or alternatively, you may sell up to 2 meat for 4 francs each. You may not enter this building if you don't convert at least 1 fish or sell at least 1 meat.
Finally: a Smokehouse without limitation. Convert any number of fish to smoked fish and double your food. However, you don't get any money for the conversion as you did at the Smokehouse. Additionally or instead of fish conversion, you may sell meat here. You get double its shipping value and don't need to pay energy like you would at the Shipping Line. However, you can do it 2 times at most for a total of 4 or 8 francs.
You may convert any number of fish to smoked fish here.
Finally: a Smokehouse without limitation.