I keep seeing a variation of this in a lot of different posts.
"I regulate my MPD to keep heat in the stove and stop it from escaping up the chimney."
Every definition for an MPD I have been able to find is it is used for controlling the draft in a fuel burning appliance. Period
Dampers are defined as restrictions either manual or automatic operation used to slow down the flow of air, gas, products of combustion in a pipe, duct, or tube.
Not once did I find a definition of an MPD's purpose being to keep heat in a stove. Insulation does that, not an MPD.
Not looking to start a flame war just opening my damper and "venting" a bit.
Using an MPD for "keeping the heat in" is an old expression. The earliest references I'm aware of, it appears in some of the operating manuals of early 1900's parlor and kitchen ranges.
I think this part of that definition is closer to the intent of that expression, "used to slow down the flow of air, gas, products of a combustion in a pipe, duct, or tube."
The old manuals used that expression to mean using a pipe damper to slow down the speed of the flue gases so they have more time to radiate out into the space being heated (or for cooking), for the amount of coal that was being burned. Not something that would need insulation.
And, I've seen that recommended in at least one general source about how to operate kitchen ranges. By using the MPD as a means to keep more heat in the stove, to raise oven temperatures if experiencing trouble getting the oven hot enough.
As I mentioned in another post, using an IR gun, I saw a rise in stove top temps with a drop in pipe temps when experimenting with MPD angles to see if it worked, and if so, is there a "sweet spot" angle. There is, but only with my stove in indirect mode - its about 35 degree MPD angle.
But, since it may not work for all types of stoves, I can see how it that would lead to being controversial.
BTW, love that last line of yours !