10 yrs ago I had Cancer recovery going on, and was very weak, low white cell counts. Decided to run my MM tractor a little, had just gotten that back running after rebuild. I was skinny and weak at time. doors all closed in a big 3 car garage. SO, started it up, was playing with carb settings and such, just let it run. I had a lawn chair there as I needed to sit down lots when weak, so I was feeling a little Blah, set down a moment. Tractor still running. At some time I passed out I guess, but woke again and barfed all over my self, then creamed my pants big time. Got up and crawled to tractor to shut off, made it to door control to open, fell down and had to crawl back in house, up to bathroom and into shower to rinse off. I was really shot for the moment. Was able to call my sister to come and check on me. They took me to Hospital and checked me out, feeling like crap all that time. Finally with a drip they made me feel some better. Could have killed me! First ever having re-action, but probly cause I was weak in first place. SO....from now on the doors come open, even on the small ones. I've also heard of another collector that always started his tractors for first time outdoors now, as one burst into flames in his shop! No damage, but could have been. Many gas stations and shops have a hose and flap going out their big doors, but most vehicles are low to ground there, no fans. The Fork Truck Repair at work has a big one up to ceiling and out, but is a fan on it. Used for gas or diesel trucks.