Question: When the burning wood dies down- smoke fills the house. The flue is fully open and I've experienced this with the glass doors open and closed.One suggestion that I've yet to try- is to close the door to my basement. Do you know what could cause this smoke getting into the house? Do I need my chimney swept. Answer: You are experiencing "Flow Reversal" which is a function of air flows within your home. When the chimney loses it's heat- it then reverses (as we know- Cold air falls). There is not any proven solution- some hints: 1. Make sure the house has plenty of combustion air and tune off all fans that may cause negative pressure--kitchen exhaust- Whole house fans. 2. A cracked or open window nearby may help. 3. When you start the fire- run it REAL HOT for awhile- this may warm the chimney mass better. 4. If you have glass doors- close them near the end of the fires burn period. 5. If you have an outside air duct to the Fireplace- open it..if not- consider installing one.