Barometric Damper Operation for Kuuma Vapor-Fire Furnaces

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.