Yes I know about the damper on your stove and there have been cases where it has not been able to be fully adjusted due to other parts getting in the way and even cases where it wasn't in its channel.
The combustion air flow becomes more dense, the metal on the stove contracts, seals can open, dampers can (in effect) move, it is harder to remove the depleted combustion air from the stove and send it up the vent as the exhaust column cools and the blower slows down (might even be affected by ash levels) and move less air, negative pressure in the area where the stove is has an increased effect and could if severe enough cancel out a good portion of the combustion blowers effectiveness. Frequently more than one thing comes into play.
The combustion air flow becomes more dense, the metal on the stove contracts, seals can open, dampers can (in effect) move, it is harder to remove the depleted combustion air from the stove and send it up the vent as the exhaust column cools and the blower slows down (might even be affected by ash levels) and move less air, negative pressure in the area where the stove is has an increased effect and could if severe enough cancel out a good portion of the combustion blowers effectiveness. Frequently more than one thing comes into play.
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