If i pack my old school stove chock full of wood let it charr bout 15 minutes then shut it down to where it wont overfire. It has a ton of smoke comin outof the chimney. Is that something you should expect in an old pre epa stove. If i dont choke it down that much it will overfire. IM burnin dry white oak tops half split half 6-8 inch rounds. Cleaned my chimney yesterday bout one gallon of fluffy creosote no glaze. Just tryin to get halfway decent burn times out of it get bout 4-6 hours and get a relight.