Looking to purchase a smoker that was built by a friends neighbor. The main cooking chamber is a 80 or 85 gallon air tank and the fire box is approx. 16-18" round and approx 40" inches long. He has two 4" pipes going into the the main cooking chamber to the left and right of center of the main cooking chamber. Do you think this would provide enough/correct heat to the main chamber. Will try to get some pictures tomorrow to post.