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My understanding is that they burn more of the particulates - they have an air re-circulation thing so that the overall burn is cleaner and less stuff comes out of the flue.
When mine has warmed up, you usually can't see anything coming out of the chimney (yes, realise that what's visible is not a valid test etc).
Very different to when I occasionally light an open fire... I will accept that is not a great thing to do so don't do it often, do use "smokeless" fuel and when I get the chance I will probably replace the open fire with a stove.
ChasnotRobert
@middleofnowhere
Do the "clean burn" models actually produce fewer particulates or are they better at venting them up the flue rather than into the room?