Hello, new to this forum and new to burning wood, I recently purchased a DS kozy king wood/coal furnace. like a kid on Christmas morning I couldn’t wait to fire it up, as the days went on I couldn’t help notice how fast it was burning through wood (seasoned oak and hickory), a full load would be turned into embers within 2 hours,I’ve got the air setting set to where DS recommends and I’ve closed it off even more, nothing seems to help. I’m also getting a lot of smoke, this furnace has secondary combustion but It can’t be working with the amount of smoke I’m seeing out of my chimney (6” SS insulated) I cant see into the firebox since it’s a solid door. I’ve been on the phone with DS multiple times and they finally said bring the furnace back for a full refund. any thoughts on this would be great.