Gen set running for 4 days in a row

Bill, We will simply have to agree to disagree. I only hope you continue to be as lucky as you have been. I will use my stack for prolonged running. I've had exhaust gases enter and trust me they were not diluted to a safe level, all it took was a dying of the breeze and we sat in a cloud. Fortunate that the CO detector woke us up. I lived aboard a large sailboat for 10 years and there were a number of instances around the world where people died from exhaust entering their cabins while motoring or at anchor.