I'm wondering what people here might do in this situation. Few yrs back I had a chimney guy do some work on chimney repair. I was satisfied with the work and service. However he did provide some info related to wood burning and carbon monoxide that I have read may be false. Again, work performed was fine, but years later with knowing more about wood burning,I am wondering if there is anything I can/should do at this point thinking that his work in other people's houses may reflect a false understanding of co2 in wood smoke.