It's the model with the side fire box. Obviously I am new to the barbecue thing, so forgive my ignorance. So, in a wood smoker, does the hardwood (i.e hickory, mesquite, apple, etc) burn to create the heat? Or, do you use charcoal to provide the heat and then add chunks of hardwood to create the smoke? If that's the case, does the hard wood sit right on the charcoal or does the charcoal heat a plate or pan that the hardwood sits in? Also, what's a tuning plate?