My father built his own stove in the mid '70s (see the attached photos). He built it based on a design a friend of his had come up with. The baffle is mounted towards the rear of the stove so that air enters the front, gasses exit along the baffle back to the front of the stove, then back around to the rear where they exit. At the leading edge of the baffle there are some air inlets (visable on top of the stove) which were there to feed fresh air to the gasses to get a little more combustion. I remember it working well and seeing some flames on top of the baffle when it was running. Is this something that used to be on older stoves, were manufacturers doing this? Or is it an early form of a clean burning non-cat stove (except the secondary combustion air isn't pre-heated)? My late '70s stove dosen't have this extra air feed. It has a 3.5 cubic foot firebox and I think it used to heat our whole, leaky, 1840s farm house (which I'm guessing may be 2000+ square feet). It has also been overfired, check out the warpage in the baffle, some can be seen on the sides too. I won't say who was responsible for that but I remember my mother saying, "Its RED HOT!" doh! The door didn't have any gaskets but it was actually pretty tight and still is. The top and short ends didn't seem to warp.