Since this discussion included some of the stoves that first developed secondary burners I would like to share what I found this morning when looking at a used Osburn stove online. I try to do as much research as possible before I purchase a stove. I found the Osburn site http://www.osburn-australia.com/en/about/history Here is part of their history.
"Mr. Mills became sole owner of the company in 1985. In its early days, the company produced only wood stoves, and in 1980 it became the first-ever North American manufacturer to make a wood stove in compliance with Oregon State's strict air emission standards."
They must have had some type of secondary burn system but 1980 There stoves today are on the pricy side but they look well built.
"Mr. Mills became sole owner of the company in 1985. In its early days, the company produced only wood stoves, and in 1980 it became the first-ever North American manufacturer to make a wood stove in compliance with Oregon State's strict air emission standards."
They must have had some type of secondary burn system but 1980 There stoves today are on the pricy side but they look well built.