Getting the heat out of the unit is important, some welders come with a fan and the have a hole in the case for where the fan would go. If you don't have a fan you may be able to add one but I wouldn't do anything until you just use it for a while. If you think about it 1 or 2 minutes of continuous welding would get you pretty far if you were making a continuous weld. Use it and see how long you can go without tripping the thermal overload. Make sure you use short extension cords if needed and make sure they are no thinner than 12 gauge.