If you have wet coal, it just might be the wet/damp coal smell, I can smell mine when I load it, but I maintain a .04-.05 draft, so I know it's not a draft problem with mine. Make sure you have a CO detector nearby.
I have a stainlees steel chimney with a barometric damper. Its not wet coal my coal is stored in garage I have a CO2 Its 18 feet from stove (what mtg suggests). The thing is I havent set my baro with a manometer yet. Just ordered it. I can only smell sulfur if I am within 6" of the top of hopper.
Hi 6, You need to get the draft checked. Is there any sweat on the inside of you hopper lid ? I would suggest to make sure that all of the pipes are clean, and set the barometric to 3 or 3.5 on the weight scale. Jerry PS, don't mess with this. GET IT FIXED.