Conceptually I think I understand it. Having a 1930's era parlor stove and having fired it now for the 4th time without the damper installed, she wastes no time at all dispatching wood and ushering insects into the afterlife. (after only a few firings I truly have a renewed respect for air tight and modern day stoves that go to great lengths in maximizing efficiency) I would guess the damper would help keep some of the heat energy in the room/stove rather than let a huge portion of it escape unimpeded all out the stack? I plan to install it tonight and have my fifth burn--good news is I am definitly learning how the stove responds to differnt loads. Are there any precautions or places not to put the damper? is there an ideal location for it? I plan to install it just above the slip joint--maybe about 24" above the stove top? Currently I have the slip joint just after the discharge piece on the stove. Your thoughts and any other suggestions/insite etc are more than welcomed. Thanks!