How to stop a down draft in a wood burning stove can vary due to a number of different reasons. We recommend to first light up some newspaper or kindling which will allow your chimney to slowly heat up. When the temperature in the chimney gradually rises, you can begin to add logs. If you still experience a down draft is in use after this then turn off your exhaust fans. What we also recommend is to check close your windows, the breeze from the windows coming through the room might create a vacuum in the house.