I have a older box stove in my jewelry production workshop and it has been fine until the last few days after burning for a while it creates a off gassing like smells faintly like diesel fumes which I am highly reactive to due to rarely triggered asthma. I have gone over it like a bloodhound and the only thing I can think of is 2” thick white insulation on garage doors about 10 feet away. But that makes no sense. I cannot work very long with out getting headache throat and eye discomfort. We seem plagued with woodstove issues this winter and kinda going crazy. Any thought. The smell is NOT coming from stove. Thanks!