I have a 55-gallon drum for a heat source and piped into a 3 x 3 x 3 smoke box. I have the door, one of the stove kits, wide open because I think I need more air intake. I'm burning ash and oak to get up to temperature but it seems like it takes a lot of wood to keep it there. Plus the wood burns up really fast. I'm thinking about cutting a couple of 2-3" holes in the front and installing a disk to work as a damper. Any thoughts or just does it take a lot of wood?