The conversation between human and AI assistant.
When I light my fireplace I can sometimes (not always) hear a hissing sound.  The wood is dry and the flue is fully open.  What could it be?
What are some other signs that my chimney may be blocked or obstructed?
Other signs of a blocked chimney include a strong smell of smoke in the room, soot or creosote buildup, difficulty lighting a fire or a fire that smokes excessively. If you notice any of these signs, it's best to have your chimney inspected by a professional to identify and fix any potential issues.