I read through the VC manual which is excellent in many respects. Yet, although there is a section on draft, it never addresses overdraft. Like there is only poor draft and normal draft, but over draft doesn't exist. This seems to be a glaring omission considering overdraft can lead to overfiring which may void the warranty. It puts the owner in a Catch22 circumstance. As a comparison, the Harman Oakwood manual, for a very similarly designed stove, has a specific paragraph for overdraft conditions. Lopi doesn't have a specific section on draft like VC and Harman, but does include a separate paragraph on overfiring the stove: Over-Firing the Stove This stove was designed to operate at a high temperature. But due to differences in vent configuration, fuel, and draft, this appliance can be operated at an excessive temperature. If the stove top or other area starts to glow red, you are over-firing the stove. Shut the air control down to low and allow the stove to cool before proceeding.