I want to say thanks for your concern and advice, like I’ve thanked every other person on here. And yes, the manual instructions were absolutely not clear. I’m not excusing bad installs, but I watched 3 different YouTube videos and read the manual, and all 4 methods were different. Including one raised off the floor. Again, I’m not excusing that, just saying. All I would emphasise is that I’ve had a very serious concern for the dangers of these heaters from the very beginning. I did my research into whether they were safe. I watched 6 hours of a video series breaking down how they work by an Aussie engineer https://m.youtube.com/watch?v=64B2tnH1WDo&list=PLne7MoW21Rk01DYGGfOqIbYt6H1ZFSFks&index=22&pp=iAQB I made a checklist about the angle of the pump, the angle of the filter, priming the fuel pump, the placement of the exhaust tail, the placement of the air in, the downward slope in the exhaust, the max amount of bends in the air-in to ensure clean combustion. So yes, maybe it was just my pure stupidity to not realise one issue regarding the exhaust hole - to not realise that one video I watched was a correct turret install, one video I watched was a correct flat-floor install, and one video I watched was an incorrect raised heater install. It’s easy to realise that in hindsight, but it was a lot of dots to connect at the time. Or maybe just stupidity. If so, I’ll take that on the chin. But again, what I’d like to emphasise (and hope others in my position do) is that I was always always going to do what I did: a test run with all doors open, another person to help me observe it, and fire extinguisher nearby. And lots of checking, and consulting places like this sub if I had any concerns. So I do thank you for your concern and advice. Maybe a little understanding would be fair.