Good day all. I recently purchase a Hearthstone Heritage soapstone stove after buring a Vermont Castngs Resolute Accalim for 19 years. The Resolute was a fine stove witha secondary burn chamber located in the lower rear section of the stove. All I had to do to get a clean, smokeless burn was to create a solid bed of coals and close the bypass damper while keeping the air at least 1/2 or greater open. No smoke was visible from my chimney. I am having diificulty learning to burn the soapstone stone without visible smoke billowing out of the chimney. I burn the soapstone stove fully open for an hour or so until I get it to around 400 degrees on the soapstone. I add wood, let it get charred for 10 minutes or so and reduce the air to about a 1/4. Sometimes the secondary combustion is visible but many times it is not, particularily if the stove is less than 400 degrees. Any suggestions would be appreciated. PeterJ.