Dreaming of exhaust – aka – byproducts from a car, furnace, etc… could represent the by-products from a project, endeavor or process in your life. If the exhaust in the dream is harmful there may be certain undesirable consequences of your actions or you may not be considering all the consequences of a certain action. Alternatively, dreaming of exhaust could represent exhaustion. You may be physically, emotionally, or spiritually exhausted in a certain area of your life. You may need time to rest, relax, and reflect on what is making you feel this way and how you can address the situation.