First off, close the lid to eliminate oxygen and more smoke. If the fan stops working, then it can cause Traeger backburn and smoke coming out of Traeger pellet box. Having a Traeger grill with a chimney is also a great way to stop backburn, especially if the fan stops working. Traeger support forums have tons of information for this same purpose that you can peruse for avoiding such pellet grill accidents. Go to https://support.traeger.com for support or customer service.