Not really, there's not much airflow when the furnace is not running.
what is the purpose of refractory lining in furnace
There should be a lever somewhere on the duct near the furnace. If it is open, the lever will be parallel to the duct. If the damper is closed, it will be perpendicular to the duct.
When you say the furnace is still running, I take that to mean the fan and not the actual flame portion of the furnace. If this is correct, you either have a fan relay that is sticking closed or your tstat is bad. == == == == There may be a very slight time delay the the thermostat before turning off the furnace, but if you are sure that you have turned the thermostat off and the fire continues to burn, you have a serious problem. Have it checked out. The gas valve may be sticking in the open position. Regards
Depending on the scale, it could be a crucible, a furnace or (only in the case of iron) a blast furnace.
Because outside it is natural warmth and because outside it's free where as inside it's closed up together
no
Closed Circuit Air Condition, known as CCAC as well... It's used in Data centers
Open, that`s where the cold air is.
Sounds like there is a damper closed somewhere.
Closed
sitting in a running car with windows closed is any fumes released inside of car.
A closed system would be full of freon without any leaks and a opened system would have no freon or has leaks...........