Posted by IaLeo on November 15, 2021 at 14:14:55 from (75.117.224.174):
In Reply to: The chimney is clean. posted by BarnyardEngineering on November 15, 2021 at 09:01:30:
Boy, this is an intriguing problem!
1. the fire goes out, but will revive (if in time) when ash door is opened. Which acts like air starvation even though the air inlets are open. HMMM.
2. some thing is not working as designed if you have to open the ash door to get enough air, possibly some inner air ductwork that normally feeds air to the fire. But why would it work sometime (daytime) and not at night???
3. is there an electric controlled damper somewhere (I know you would know if there was...just puzzling this out) that gets turned off with the lights...but that should restore draft if you turned the lights back on to check on the fire!
4. if the flue is all metal and mostly outdoors, I could see the damper, colder night air chilling the chimney, discouraging draft, but you have indicated that the metal flue was a liner in some older construction...hmmm.
5. is there any other flue-using appliance connected into this flue?
Thanks for a fun puzzle that should be simple physics in operation! Best of luck solving this and I hope you share what the solution is, if any. Leo in NE Iowa burning junk wood from around an old farmstead...processing it for the retirement exercise.
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