Thermostatically Controlled AD-1 Draft Inducer

lsayre wrote:Lightning, have you considered adding a bimetallic damper to the air inlet of your stove? I did this years ago to a wood stove and it noticeably improved the consistency of the heat output. Should work even better with coal.

If there is nowhere else to locate one, you might even be able to replace your manual air inlet knob with a bimetallic unit at the same location.

Yeah, I've looked at doing that.. Overall though, basically a bimetallic unit would do exactly what my barometric damper already does. The baro keeps heat output flat by keeping the negative pressure in the furnace consistent. Thanks for your suggestion

Sorry to disagree, barometric damper and bi-metallic damper are far from doing the same job.
I kind of see your thinking here, but must disagree...others must not read here and misunderstand.

The biggest difference is that the bimetallic damper is affected by surrounding TEMPS (room/side of stove temps) and baro only responds to stack PRESSURE, (negative)
So we have the comparsion of apples to oranges here.

Do stack temps affect pressure? And does stack pressure affect stove temps?
YES, but one's function cannot replace the other's...they are not the same. One is a pressure control and one is a temp control... and they both can play together when necessary.
Hope this helps.

Yeah I think my wording was misleading.. what I meant was, the baro keeps negative pressure steady... this keeps combustion air steady which in turn keeps heat output steady..

The bi metallic damper allows more air in if the stove body cools or closes if it gets too warm.. This keeps the stove heat output steady.. right?

They both keep heat output steady but perform and function in a different manner..

Yeah, knew you had the grasp of it all.

Just want newcomers to not think to interchange them one for the other.

Right.. right..