Our owner’s manual says you should have a draft between .03 and .06. These are generic numbers based on the average house. In reality, the chimney of a two-story home that is 30-35 feet tall in most cases will generate substantially more draft than a chimney in a ranch-style house. A good starting point on a two-story home would be to set your barometric damper on #3. If you have a one-story, ranch-style house, start on #4 or #5. If you get a high temp alert (steady tone from computer control), reduce the number on your barometric damper by 1. On the other hand, if you consistently get a huge coal bed at the end of the burn, then increase the number on your barometric damper by 1.