Once you get your draft dialed in with the barometric draft regulator, using either a draft gauge or manometer, you will be able to then have a better feeling for where the spinner on the ash door and the flap on the combustion blower, or top spinner if you don't have the draft kit, will be. It is hard to say where you should place them. It is really based upon the needed heat demand of your structure that you are trying to heat. Once you figure out where the air draft controls need to be for the needed heat recovery in relationship to the outside temperature, record this and you will always be able to duplicate the results. I can only guess from here.